Alloran VISSER.jpg
Esplin 9466 Prime
Biographical information



Unnamed Gedd
Unnamed Hork-Bajir
Fet Mashar †
Unnamed Hork-Bajir
Gah Fillat
Unnamed Hork-Bajir
Hedrick Chapman (briefly; 1976)
Alloran-Semitur-Corrass (1976-2000)






Esplin 9466 Lesser (twin brother)


Yeerk military officer


Yeerk Empire

Behind the scenes
First appearance

The Invasion
The Hork-Bajir Chronicles (chronologically)

Last appearance

The Beginning


Imprisoned for war crimes


Eugene Lipinski (season 1)
Tom Barnett (season 2)

"The mistake was following the path laid down by you, Visser One. You and your Sharing, your one-host-at-a-time, your slow, steady infiltration. We took the Gedds. We took the Hork-Bajir! Took them! We made allies of the Taxxons, but if they had resisted, we would have taken them, too! Do you think we will infiltrate the Andalites when that time comes? Will we form little social clubs and talk them into becoming our slaves? No! When we are ready we will take them, too! We are the Yeerk Empire! We are not a race of sneaks and spies. We are rulers, conquerors!"
―Esplin 9466[src]

Esplin 9466 is a former officer of the Yeerk military. In his capacity as the leader of the Yeerk invasion of Earth, he served as the Animorphs' primary foe. For most of the series, he held the rank of Visser Three, but was promoted to the rank of Visser One towards the end of the war. In addition to being one of the first Hork-Bajir-Controllers, Esplin 9466 also possesses the distinction of being the first human-Controller and the first Andalite-Controller in history.



"I come from no regular Yeerk pool. I was born from the decaying bodies of my tripartite parents, along with several hundred brothers and sisters, aboard ship. And one twin, naturally, as you know from the double-number designation. I have never lived on the home world. I was born in a sterile, titanium-alloy tank, beneath the warmth of a portable Kandrona. It was all I knew. [...] So we lived in our pool. As simple Yeerks must. And I would have lived happily enough. But then came the day when it was my turn to take "training.""
―Esplin 9466[src]

Esplin 9466 was born between 1966 and 1968 in an artificial Yeerk pool on board a captured Andalite ship shortly after the Yeerk exodus from their home world.

Studious Ambitions[]

"I would never be a scientist. I knew I didn't have that kind of mind. But perhaps there was something else I could learn from the Andalite computer. Something that would make me fit for a host. [...] Know your enemy. That was my calling. That was the way to gaining my own host. I would learn all the computer held about the magnificent, powerful creatures called Andalites. Someday we would face the Andalites in battle. Then I would be needed."
―Esplin 9466[src]

At the time, the Yeerks had only a small number of Gedds to use as host bodies, and so each of the quarter million Yeerks on the convoy were given fifteen minutes "training" in a Gedd host. When Esplin's turn came up, he was so overwhelmed by the experiences of sight, hearing and greater mobility that he made it his ambition to be one of the few Yeerks to always possess a host body. He had a twin brother named Esplin 9466 Lesser. To help increase his chances of achieving his dream, he immersed himself in Andalite culture, biology, and military tactics, taking a famous Andalite saying – "Know your friends well. Know your enemies better." – as his axiom. He quickly became the pre-eminent expert on all affairs Andalite in the gestating Yeerk Empire. Through this initial research, Esplin fostered a deep desire to one day infest an Andalite, so that he might truly understand them.

Hork-Bajir Conflict[]

Launching the Hork-Bajir Infestation[]

This section requires expansion
"Months went by, and slowly the memory of those few amazing moments in the Gedd faded. Others were called to assume hosts. I was not. But then it happened. Palp to palp, the message came to me. Esplin 9466 to the infestation pier! There was a new species to try. After failures with the Hawjabrans and only the few Ongachics, our wandering assemblage of spacecraft had found a new planet. With new creatures. Three had been seized from the surface and brought aboard. One was for me."
―Esplin 9466[src]

Soon after arriving at the Hork-Bajir homeworld, the Yeerks capture two specimens to examine for their fitness of infestation. Esplin is called to the pier, and becomes the first Yeerk to inhabit a Hork-Bajir as a permanent host. He utters the words "Yes, these creatures will be our weapons," and seals the fate of the Hork-Bajir.

Andalite Hunting[]

"You see, I had already realized one very important thing: From now on, the host body one had would be an indication of power. Already there were lines of distinction between Yeerks who had Gedd hosts and Yeerks who were given the new, powerful Hork-Bajir bodies. These Hork-Bajir would be our shock troops. But there was still one host better than Hork-Bajir: Andalite. Yes, the Yeerk who could take an Andalite host would be more than a mere sub-visser. The Yeerk who could take and hold an Andalite host would be a visser, at the very least. And someday, who knows? A seat on the Council of Thirteen?"
―Esplin 9466[src]

To be added

Newfound Promotion[]

"I heard the title and swelled with pleasure. I had been newly promoted. Up from Sub-Visser Seventeen, my first command rank. It was a jump of five places! Sub-Vissers Sixteen and Fourteen had been promoted. Sub-Visser Thirteen had been killed in battle against Hork-Bajir rebels. Sub-Visser Fifteen was being executed for incompetence and cowardice. [...] But I was in command. I was the twelfth highest-ranking sub-visser. Beyond that there were nine vissers. But every day there were promotions. Every day new sub-vissers and vissers were added. We were growing! These were amazing, heady days."
―Esplin 9466[src]

When the first Andalite forces arrive, Esplin, now known as Sub-Visser Twelve, leads the fighter attack against the Andalites. Using his knowledge of Andalite tactics and technology, his counter-measures prove to be effective, and he manages to survive the struggle against the then-superior Andalite forces, though most of his comrades are lost. By the end of the conflict, Esplin has established himself as one of the most prominent Yeerks of his generation.

Taxxon Homeworld[]

Encountering Elfangor[]

"There is one other possibility, Andalite. There has never been an Andalite-Controller. None of us has ever succeeded in capturing an Andalite alive. Your warriors use that nasty Andalite tail blade on themselves rather than be taken alive. Such a waste. Really. See, I want to be the first to have an Andalite body. With that body, with the Andalite morphing power, I wouldn't remain a sub-visser for long. I could be a full visser. [...] Let me take that Andalite body. You'll live. It's the only way you'll live."
―Esplin 9466 to Elfangor-Sirinial-Shamtul[src]
This section requires expansion

Esplin, now Sub-Visser Seven, is in charge of security on the Taxxon homeworld. He encounters Elfangor-Sirinial-Shamtul, Arbron, and Alloran-Semitur-Corrass on the Taxxon homeworld, and their two human charges, Loren and Chapman.

Infesting Alloran[]

"He stood there, rage on his face. Alloran. War-Prince Alloran-Semitur-Corrass. But not really Alloran anymore. For the rest of my life I would remember that moment. The moment when I looked for the first time, upon the abomination. You see, Alloran was no longer Alloran."

Esplin conducts a little signing negotiation with Chapman, understanding that the human race could be a useful new host species. During a skirmish with Elfangor, Esplin’s host is knocked unconscious, along with Alloran. Esplin uses the unguarded moment to acquire Alloran as a host body, becoming the first Andalite-Controller in history. He gives all his knowledge of Andalite fleet movements and modern tactics and technology to the Council of Thirteen, and they reward him for his efforts.

Using the Time Matrix[]

"We are falling toward a black hole in a dead ship. But we have a way out. The Time Matrix."
"In case you haven't noticed, Visser, the Time Matrix is strapped to the outside of the ship. The outside. In fact, it's probably drifting free. It was held in place with energy ropes. Those are gone."
"Gravity. There should be just enough attraction between the ship and the Time Matrix to keep it close."
―Esplin 9466 and Elfangor-Sirinial-Shamtul[src]
This section requires expansion

Esplin later arrives when it becomes known that the Skrit Na obtained the Time Matrix, now Visser Thirty-Two. He becomes entangled with Elfangor and Loren, and the result of their meddling with the Time Matrix as all three of them try to use it to go home results in a warped universe, part Earth, part Andalite homeworld, and part Yeerk Homeworld. In a final stand-off with Elfangor and Loren, Esplin travels through a rift and apparently returns to the Jahar, falling into a black hole, but he survives under unspecified circumstances.

Later, when the Ellimist warps Elfangor out of his original timeline, Esplin has already reached his trademark rank, Visser Three. Elfangor rams his Blade Ship, and the battle ends with an Andalite victory as Esplin retreats his forces. This battle makes Elfangor a Prince.

Visser Three is given the assignment of assuming control of the invasion of Earth. It is a job he doesn’t seem to care for initially, but this reveals how important the Yeerks view the invasion. When the Andalites finally do send a military force to Earth, Visser Three hides his bladeship in a crater on Earth’s moon. The resulting sneak attack results in the Andalites being overwhelmed and ultimately destroyed except for Elfangor, who dies shortly thereafter at the Visser’s hands, and Ax.

Invasion of Earth[]

Encountering the Andalite bandits[]

"Earth is not ours because of the incompetence and treason of Visser Three. I left Earth in a position to be taken!"
"You left Earth before the Andalites landed a force of trained guerillas and saboteurs armed with morphing technology!"
Edriss 562 and Esplin 9466[src]

Visser Three moves the invasion along nicely, already in the later stages. He is soon confronted by the Animorphs, whom he believes to be "Andalite Bandits", his views on Andalites preventing him from considering the possibility that the Animorphs may just be humans with the power to morph. Within a few months, his main Kandrona generator is destroyed, and he gets into trouble when he captures the Animorphs and Visser One's personal bodyguards discreetly set them free.

He orders two hundred Human-Controllers each month, according to The Capture in the town the Animorphs live. This included an entire hospital staff from the East Wing Hospital, writers, teachers, TV actors and hosts, and anyone in political power to join The Sharing. This will include the governor of where the Animorphs live, but it is unknown what happened to the state's governor. It is unclear whether the governor was infested by a Yeerk from the Yeerk pool, or the governor was rescued by the Animorphs when they 'captured' and starved Temrash 114, who had been assigned to be the governor's Yeerk.

Escalating the Invasion[]

"You've never understood anything but brute force and crude manipulation, Visser Three. Your plans are grandiose and absurd. You wasted how much time and how many resources inventing a clever potion to destroy human free will? A failure! As anyone who knows humans could have told you. You try and seize control of the head of state of the most powerful nations and end up alarming them, making half of them suspect our presence on Earth! You spend a fortune in pursuit of an Anti-Morphing Ray that doesn't work! Why? Because you cannot even manage to wipe out a handful of Andalite refugees!"
Edriss 562[src]

As the series progresses, Visser Three finds himself increasingly put off-balance by the Animorphs' actions, even if they manage to keep him ignorant of the scale of their involvement in some cases. Thanks to the Animorphs, not only do various Hork-Bajir hosts escape to start a new colony hidden in the mountains, but the Yeerks' plans to use the telepathic Leerans as host or genetically engineer the arctic species the Venber to act as a slave race are each cut off before they can progress beyond the initial stages. Attempts to expose the Yeerk Peace Movement or develop an Anti-morphing ray to capture his enemies are also disrupted by his enemies' interference.

Promotion to Visser One[]

"The newly appointed Visser One, recently Visser Three, current leader of the Yeerk mission on planet Earth... has approved Operation 9466. Visser Two has undertaken a journey to Earth to assist in the execution of this long-anticipated military action."
―Yeerk Transmission[src]

To be added

Open War[]

This section requires expansion

When he discovers the truth of the Animorphs' identities and escalates the conflict, it forces the Animorphs to retreat to the Hork-Bajir colony with most of their families.


"You're the one called Jake, aren't you? The brother of my security chief's host body."
"That's me."
"As you see, my Blade ship is approaching. [...] The Blade ship will attack, and I am helpless, unable to control this ship. Only a traitor could have beaten me. I was not beaten by you, human, or by your pet Andalite there. I was undone by my trusting nature. Only another Yeerk could have beaten me, and then only by the lowest treason. I was not beaten by you. Never by you."
―Esplin 9466 and Jake[src]
This section requires expansion

When the Andalites arrive, the Animorphs are able to force a stand-down, resulting in the now-promoted Visser One retreating from Alloran. Esplin was then kept as a prisoner on Earth pending trial.


"We have this just coming in. The five judge panel in The Hague has returned convictions on twenty-two of twenty-five counts of war crimes against the Yeerk, Visser One. Visser One, of course, led the Yeerk invasion of Earth and was in command of all Yeerk and allied forces at war's end. The decision means that Visser One will almost certainly never be released from the specially constructed prison facility that has been built in Kansas. The trial was televised live around the world for three weeks during which time seventy three witnesses took the stand to substantiate the charges and allegations. Jake Berenson was the first witness, followed by the rest of the living and available Animorphs, and many, many others. And now, we're going to go to our CNN legal analyst, Greta Van Susteren, for analysis of this truly unique moment in legal history."
―CNN Breaking News[src]
This section requires expansion

Despite attempting to get Jake charged with war crimes, he is left incarcerated in his natural state on Earth for crimes against humanity.


"I understand you perfectly, Esplin-Nine-Four-Double-Six. You have the necessary brutality without the necessary subtlety. You are crude and emotional. You've made no progress with Earth. None. For all your grandiose schemes you are no further toward your goal than when you took over."
Edriss 562[src]

Esplin is a no-nonsense Yeerk, personifying the cold and heartless enemy the Animorphs are up against. He keeps subordinates in line with fear over incentive, and isn’t above the random execution, just to keep the rest in line.

Esplin's twin brother was initially his comrade in arms, but eventually the pair became antagonistic towards each other, with Esplin declaring his brother a traitor. The other Esplin became a cannibal, killing other Yeerks in order to sustain his own need for Kandrona rays, and suspected that Visser Three only kept him alive in hopes of obtaining this technique. The home of Esplin's twin's host body on Earth later burned down under mysterious circumstances; it is unknown whether this was perpetrated by the Animorphs or by Visser Three himself.

Esplin is a war hero to his people in a similar way Elfangor is to his, and the two share a bitter hatred towards each other almost from the moment they meet. Though Esplin isn’t as selfless and valiant as Elfangor, he appears to be far more cunning, as demonstrated in most of the battles of wits he has with Elfangor, he emerges the victor.

He does enter a rivalry with then Visser One, and their rivalry was something of a legend, even among Andalite circles. He has a close friendship with Visser Four, the head of the Leeran invasion; though, with Esplin’s personality, it is most likely a political alliance more than friendship.

Most Yeerks possess some kind of relationship with their hosts, often not a positive one, and Alloran long ago gave up his fight with Esplin so until book 54 he remained an entire slave, not even thinking to be free once more. In book 54, however, once defeated by the Animorphs and Tom the traitor, Esplin voluntarily relinquished his hold on Alloran, favoring the Animorphs' punishment to what the Council would sentence him to, and Alloran was overjoyed to be free again, once and for all.


Morph Book Acquired/Used
Djabala, Kafit bird Prior to The Andalite Chronicles
Taxxon The Andalite Chronicles
Antarean Bogg The Invasion
Unnamed Creature with Eight Heads and Eight Legs and fire breathing from capabilities
Vanarx The Visitor
Huge unnamed creature with three legs, tiny head, and a rock like appearance
Mardrut The Message
Human The Capture
Amazonian Snake (unusable; Sario Rip) The Forgotten
Lebtin Javelin fish The Reaction
Unnamed Giant Yellow Sea Serpent creature The Escape
Unnamed Winged porcupine-like creature The Underground
Human (Hewlett Aldershot III; possibly) The Decision
Dule Fansa, Human (Tony) The Discovery
Unnamed Lizard Creature The Threat
Human (Aria) The Pretender
Unnamed creature with a Medusa-like head, with a scythe-shaped blade on each of the "snakes" The Suspicion
Unnamed creature with an appearance resembling an eyeball, with long yellow tentacles for eyelashes The Sickness
Unnamed Chameleon Land Crab creature The Reunion
Luminar The Mutation
Unnamed putrid creature The Weakness
Unnamed tar creature The Hidden
Bievilerd The Revelation
Unnamed acidic crature The Return
Unnamed creature, which resembled a mound of living, carnivorous, Jell-O
Unnamed creature, with an appearance like a giant squid covered in hard black scales, with twenty spike covered tentacles The Ultimate
Giant Octopus The Sacrifice

Books Narrated By Esplin 9466[]


  • Esplin 9466 has the title Visser Three from books #1-45 in the series. After the original Visser One is killed in book 45, he becomes Visser One for the rest of the series.



Vissers in the Yeerk Empire
Visser One Visser One | Visser One
Visser Two Visser Two
Visser Three Visser Three
Visser Four Visser Four
Visser Thirty-two Visser Thirty-two