Rise of the Wolf

The Invasion (Animorphs #1)

The Underland Chronicles Book Five: Gregor and the Code of Claw

Rage of Lions

The Underland Chronicles Book One: Gregor the Overlander

The Wild Robot Escapes

The Underland Chronicles Book Two: Gregor and the Prophecy of Bane

The Underland Chronicles Book Four: Gregor and the Marks of Secret

The Underland Chronicles Book Three: Gregor and the Curse of the Warmbloods

The Encounter (Animorphs #3)

The Visitor (Animorphs #2)

The Message (Animorphs #4)

The Predator (Animorphs #5)

Frost Wolf (Wolves of the Beyond #4)

Hunted (Spirit Animals, Book 2)

Blood Ties (Spirit Animals, Book 3)