The Extreme is the twenty-fifth book in the Animorphs series, written by K.A. Applegate. It is narrated by Marco.

This article is written from a Real World point of view.


Official Description

Marco, the other Animorphs, and Ax have managed to find out where the Yeerks are planning to build their next ground-based Kandrona. That's a good thing. The location is supposed to be somewhere near the North Pole. That's a bad thing. The Animorphs and Ax know that the Yeerks are a "cold-blooded" species, but this is a little nuts! Who wants to be near the North Pole without Arctic morphs -- and wearing spandex?

Even so, the kids know that if the Yeerks succeed with their plan, Earth is pretty much done for. And Marco, the other Animorphs, and Ax aren't quite ready to give up the fight...


Marco  fails to get together with a girl named Marian. Later, Erek King tells Marco the Yeerks' plan to manipulate U.S. satellites to beam Kandrona rays into swimming pools, turning each into a Yeerk pool. That way, Controllers won't have to travel to the Yeerk pool, and the Animorphs would lose their advantage over them. The Yeerks are conducting their latest scheme in the Arctic Circle.

The Extreme illustration

Inside cover depicting the animorphs trudging around in their polar bear morphs.

The Animorphs hitch a ride on Visser Three's Blade Ship as flies. On board, they discover cryogenic tubes with strange creatures inside them. Their presence is discovered by the Yeerks, and they're forced to morph their battle creatures. Jake orders a distraction, and Marco rips open the control panel to open the ship's hatch. Rachel, with all her grizzly bear might, manages to make a single, tiny crack in one of the specimen tubes. A liquid nitrogen-like mist spills out, freezing every living thing it touches. A nasty fight ensues, and the Animorphs bail out.

Falling out into the frozen tundra, the Animorphs find themselves freezing to death. They morph wolves , but they need energy to keep going. At night - since none of them can sleep - Ax  tells the chilling tale of the new aliens, the Venber, a species from the Andalite moon Venbea, that was wiped out centuries ago by a race known as "The Five ", melting them for computer semiconductors. Not only that, but the Yeerks have cloned them by cross-breeding them with humans, giving them their new humanoid shape. Then, they find a polar bear that had just killed and partially consumed a seal. The Animorphs eat the remains. Much to their surprise, not even Cassie has any scruples. They also find two seal pups - the pups of the seal they'd just eaten. Regretfully, they acquire the pups and leave them to their fate.

Soon the Animorphs find themselves pursued by the creatures Marco had observed in the tubes. They morph seals to escape them, but are attacked by orcas in the freezing depths.

Later, they come across Derek, a young, jocular Inuit, and his "buddy", Nanook the polar bear. Derek tells them about the people with the satellite dish, and how they're even worse than the American and Canadian elite who shoot wildlife from helicopters for the adrenaline rush. The Animorphs are presented with an opportunity to acquire the DNA of a native animal, and so they attack Nanook. After pinning him down, they each acquire him, and morph him.

The Animorphs, in their new polar bear morphs, advance on the Yeerk base. They encounter the Venber, engaging them in a brutal battle. They lure the remaining Venber into the hangars, where the above-zero conditions cause them to melt. The Animorphs then steal a Yeerk Bug fighter, and Marco immolates the Yeerk base. Soon to be intercepted by the Blade ship, they morph birds and ditch the alien craft over the West Coast, and fly home.


Featured Characters:

Supporting Characters:


Contributions to the Series' Story Arc

  • This marks the first occasion where the Chee pose as the Animorphs for their families while they are away on a long-term mission.


Morpher Morphs acquired Morphs used
Jake Baby Seal, Polar Bear Peregrine Falcon, Fly, Siberian Tiger, Wolf, Baby Seal, Polar Bear
Rachel Baby Seal, Polar Bear Bald Eagle, Fly, Grizzly Bear, Wolf, Baby Seal, Polar Bear
Cassie Baby Seal, Polar Bear Osprey, Fly, Wolf, Baby Seal, Polar Bear
Marco Baby Seal, Polar Bear Osprey, Fly, Silverback GorillaWolf, Baby Seal, Polar Bear
Tobias Baby Seal, Polar Bear Fly, Flea, Baby Seal, Polar Bear
Ax Baby Seal, Polar Bear Human (Main), Northern Harrier, Fly, Flea, Baby Seal, Polar Bear


  • The cover quote is, "So many Yeerks, so little time...."
  • The inside cover quote is "Can you say 'cold'?"
  • This is the fifth book in which all the Animorphs acquire the same new morph.
  • This was the only book cover to show Marco wearing a button shirt, all of his other covers show him wearing either long sleeved shirts or in some cases regular T-shirts.
  • ANIBASE : A lot of things influence a writer. For Katherine Applegate, this time it was the weather. This book was created during a particularly cold time of the year in her former hometown of Minneapolis hen it was below freezing outside!
  • Starting with this book, many of the books in Animorphs were ghostwritten.


International Covers

Taken from

Main Series #1 The Invasion | #2 The Visitor | #3 The Encounter | #4 The Message | #5 The Predator | #6 The Capture | #7 The Stranger | #8 The Alien | #9 The Secret | #10 The Android | #11 The Forgotten | #12 The Reaction | #13 The Change | #14 The Unknown | #15 The Escape | #16 The Warning | #17 The Underground | #18 The Decision | #19 The Departure | #20 The Discovery | #21 The Threat | #22 The Solution | #23 The Pretender | #24 The Suspicion | #25 The Extreme | #26 The Attack | #27 The Exposed | #28 The Experiment | #29 The Sickness | #30 The Reunion | #31 The Conspiracy | #32 The Separation | #33 The Illusion | #34 The Prophecy | #35 The Proposal | #36 The Mutation | #37 The Weakness | #38 The Arrival | #39 The Hidden | #40 The Other | #41 The Familiar | #42 The Journey | #43 The Test | #44 The Unexpected | #45 The Revelation | #46 The Deception | #47 The Resistance | #48 The Return | #49 The Diversion | #50 The Ultimate | #51 The Absolute | #52 The Sacrifice | #53 The Answer | #54 The Beginning
Megamorphs The Andalite's Gift | In the Time of Dinosaurs | Elfangor's Secret | Back to Before
Chronicles The Andalite Chronicles | The Hork-Bajir Chronicles | VISSER | The Ellimist Chronicles
Alternamorphs The First Journey | The Next Passage
TV Tie-Ins Meet the Stars of Animorphs

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