
The Absolute, published in 2001, is the 51st book in the Animorphs series, written by K. A. Applegate. It is known to be written by Lisa Harkrader. It is the final book (fully) narrated by Marco.

The Alien is the eighth book in the Animorphs series, written by K. A. Applegate. It is the first book narrated by Ax.

The Andalite Chronicles is a science-fiction novel, and is the first companion book to the Animorphs series, written by K. A. Applegate. Within the timeline of the series, this book takes place before the first book in the series, The Invasion. The book was published in November 1997, and was followed the next year by the second companion book in the Chronicles series, The Hork-Bajir Chronicles. Before its wide release, however, the story was offered in the form of 3 separate volumes to school book clubs, which some considered a "typically savvy" marketing move.

<Megamorphs> #1: The Andalite's Gift is the first book in the <Megamorphs> series, a set of companion books to the Animorphs series. With respect to continuity, it takes place between Book #7: The Stranger and Book #8: The Alien. The Andalite's Gift was originally published as two parts and later put together as one book as #2 of Megamorphs came out.

The Android is the tenth book in the Animorphs series, written by K.A. Applegate. It is narrated by Marco.

The Answer is the 53rd and penultimate book in the Animorphs series. It is the final book (fully) narrated by Jake and is the final book to fully be narrated by only one character.

The Arrival is the 38th book in the Animorphs series, written by K.A. Applegate. It has been ghostwritten by Kim Morris. It is narrated by Ax.

The Attack is the 26th book in the Animorphs series, written by K.A. Applegate. It has the distinction of being the last book in the series written by Applegate on a regular schedule; with The Separation, the final two books in the regular series; The Answer and The Beginning, two Megamorphs books; Elfangor's Secret and Back to Before, and the chronicles; Visser, and The Ellimist Chronicles being the only other Animorphs related books written by her after this was published. It is narrated by Jake.

Megamorphs #4: Back to Before is the fourth and final book in the Megamorphs series, a spinoff of the Animorphs series. With respect to the continuity in the Animorphs books, it takes place between The Other (#40) and The Familiar (#41).

The Beginning is the 54th and final book in the Animorphs series. Unlike other Animorphs books in the main series, but similar to the Megamorphs, all characters conduct narration instead of just one.

The Capture, published in 1997 and written by K. A. Applegate, is the sixth book in the Animorphs series. It is narrated by Jake. The Capture was re-released by Scholastic in March 2012.

The Change is the 13th book in the Animorphs series, written by K.A. Applegate. It is narrated by Tobias.

The Conspiracy is the 31st book in the Animorphs series, authored by K.A. Applegate. It is known to have been ghostwritten by Laura Battyanyi-Weiss. It is narrated by Jake.

The Decision is the 18th book in the Animorphs series, written by K.A. Applegate. It is narrated by Ax.

The Departure is the 19th book in the Animorphs series, written by K.A. Applegate. It is narrated primarily by Cassie and secondarily by Jake, who narrates several chapters towards the end of the story.

The Discovery is the 20th book in the Animorphs series, written by K.A. Applegate. It is narrated by Marco. It is the first book in the David trilogy.

The Diversion, published in 2001 and written by K. A. Applegate, is the 49th book in the Animorphs series. It is known to have been ghostwritten by Lisa Harkrader. It is the final book (fully) narrated by Tobias.

The Ellimist Chronicles is a children's science-fiction novel, a companion book to the Animorphs series written by K. A. Applegate. It tells the backstory of the Ellimist, a god-like being from the story. The introduction shows that the Ellimist is telling his story to an unnamed, dying Animorph, foreshadowing the events of the final book of the series.

The Encounter, published in 1996 and written by K. A. Applegate, is the third book in the Animorphs series. It is narrated by Tobias.

The Escape is the 15th book in the Animorphs series, written by K.A. Applegate. It is narrated by Marco.

The Experiment is the 28th book in the Animorphs series, written by K.A. Applegate. It is known to have been ghostwritten by Amy Garvey. It is narrated by Ax.

The Exposed is the 27th book in the Animorphs series, written by K.A. Applegate. It is known to have been ghostwritten by Laura Battyanyi-Weiss, although due to an editorial oversight, Battyanyi-Weiss was uncredited for this book. It is narrated by Rachel.

The Extreme is the 25th book in the Animorphs series, written by K.A. Applegate. It is known to have been ghostwritten by Jeffrey Zeuhlke. It is narrated by Marco.

The Familiar is the 41st book in the Animorphs series, written by K.A. Applegate. It is known to have been ghostwritten by Ellen Geroux. It is narrated by Jake.

The Forgotten is the 11th book in the Animorphs series, written by K.A. Applegate. It is narrated by Jake.

The Hidden is the 39th book in the Animorphs series. It was ghostwritten by Laura Battyanyi-Wiess. It is narrated by Cassie.

The Hork-Bajir Chronicles is the second companion book to the Animorphs series, written by K. A. Applegate. With respect to continuity within the series, it takes place before book #23, The Pretender, although the events told in the story occur between the time of The Ellimist Chronicles and The Andalite Chronicles. The book is introduced by Tobias, who flies to the valley of the free Hork-Bajir, where Jara Hamee tells him the story of how the Yeerks enslaved the Hork-Bajir, and how Aldrea, an Andalite, and her companion, Dak Hamee, a Hork-Bajir, tried to save their world from the invasion. Jara Hamee's story is narrated from the points of view of Aldrea, Dak Hamee, and Esplin 9466, alternating in similar fashion to the Megamorphs books.

The Illusion is the 33rd book in the Animorphs series, written by K.A. Applegate. It is known to have been ghostwritten by Ellen Geroux. It is narrated by Tobias.

Megamorphs #2: In the Time of Dinosaurs is the second book in the Megamorphs series, a set of companion books to the Animorphs series. With respect to continuity, it takes place between book #18, The Decision and book #19, The Departure. The Megamorphs books are narrated by all six members of the Animorphs, in turns, but there is no specific order, unlike the order of narration in the regular series.

The Invasion, published in 1996 and written by K. A. Applegate, is the first book in the Animorphs series. It is narrated by Jake.

The Journey is the 42nd book in the Animorphs series, written by K. A. Applegate and published in May 2000. It is known to have been ghostwritten by Emily Costello. The book is narrated primarily by Rachel and secondarily by Marco.

The Message, published in 1996 and written by K. A. Applegate, is the fourth book in the Animorphs series. It is narrated by Cassie.

The Mutation is the 36th book in the Animorphs series, written by K.A. Applegate. It is known to have been ghostwritten by Erica Bobone. It is narrated by Jake.

The Other is the 40th book in the Animorphs series, ghostwritten by Gina Gascone. It is narrated by Marco.

The Predator, published in 1996 and written by K. A. Applegate, is the fifth book in the Animorphs series. It is narrated by Marco.

The Prophecy is the 34th book in the Animorphs series, authored by K.A. Applegate. It is known to have been ghostwritten by Melinda Metz. It is narrated primarily by Cassie and secondarily by Aldrea.

The Proposal is the 35th book in the Animorphs series, authored by K.A. Applegate. It is known to have been ghostwritten by Jeffrey Zuehlke. It is narrated by Marco.

The Reaction is the 12th book in the Animorphs series, written by K.A. Applegate. It is narrated by Rachel.

The Resistance is the 47th book in the Animorphs series, written by K.A. Applegate. It is known to have been ghostwritten by Ellen Geroux. It is the third book in the ten-book arc that finalized the story of the Animorphs. It is primarily narrated by Jake, with flashbacks secondarily narrated by Isaiah Fitzhenry, a great-uncle of Jake's grandfather who was an American Civil War lieutenant.

The Return is the 48th book in the Animorphs series, written by K. A. Applegate. It is known to have been ghostwritten by Kimberly Morris. Due to an editorial oversight, Lisa Harkrader was mistakenly credited with writing the book. It is the last book (fully) narrated by Rachel. It is the fourth of the last ten books to have an inverted title, in which the main title is in color and the background of the title is in black, showing a definite change.

The Reunion is the 30th book in the Animorphs series, authored by K.A. Applegate. It is known to have been ghostwritten by Elise Donner. It is narrated by Marco.

The Revelation is the 45th book in the Animorphs series, written by K.A. Applegate. It is known to have been ghostwritten by Ellen Geroux. It is the first book in the ten-book arc that finalized the story of the Animorphs. It is narrated by Marco.

The Sacrifice is the 52nd book in the Animorphs series, written by K. A. Applegate. It is known to have been ghostwritten by Kim Morris. It is the final book to be (fully) narrated by Ax.

The Secret is the ninth book in the Animorphs series, written by K.A. Applegate. It is narrated by Cassie.

The Separation is the 32nd book in the Animorphs series, written by K.A. Applegate. It is narrated by the two "halves" of Rachel. This is the only numerical book written by Applegate, and not a ghostwriter, between #26 and #53.

The Sickness is the 29th book in the Animorphs series, authored by K. A. Applegate. It is known to have been ghostwritten by Melinda Metz. It is narrated by Cassie.

The Solution is the 22nd book in the Animorphs series, written by K.A. Applegate. It is narrated by Rachel. It is the last book in the David trilogy.

The Stranger is the seventh book in the Animorphs series, written by K.A. Applegate. It is narrated by Rachel.

The Suspicion is the 24th book in the Animorphs series, written by K.A. Applegate. It is narrated by Cassie.

The Test is the 43rd book in the Animorphs series, written by K.A. Applegate. It was ghostwritten by Ellen Geroux. It is narrated by Tobias.

The Threat is the 21st book in the Animorphs series, written by K.A. Applegate. It is narrated by Jake. It is the second book in the David trilogy.

The Ultimate, published in 2001 and written by K.A. Applegate, is the 50th book in the Animorphs series. It is known to have been ghostwritten by Kimberly Morris. It is the final book (fully) narrated by Cassie.

The Underground is the 17th book in the Animorphs series, written by K.A. Applegate. It is narrated by Rachel.

The Unexpected is the 44th book in the Animorphs series, written by K.A. Applegate. It is known to have been ghostwritten by Lisa Harkrader. It is narrated by Cassie.

The Unknown is the fourteenth book in the Animorphs series, written by K.A. Applegate. It is narrated by Cassie.

The Visitor, published in 1996 and written by K. A. Applegate, is the second book in the Animorphs series. It is narrated by Rachel.

Visser is the third companion (Chronicles) book to the Animorphs series, written by K. A. Applegate. Within the continuity of the series, it takes place directly after the events of book #35, The Proposal. The book is narrated by Edriss 562 who is on trial for treason by the Yeerk Council of Thirteen.

The Warning is the 16th book in the Animorphs series, written by K.A. Applegate. It is narrated by Jake.

The Weakness is the 37th book in the Animorphs series, written by K.A. Applegate. It is known to have been ghostwritten by Elise Smith. It is narrated by Rachel.