The Time Crocodile (novel)

The Time Crocodile was a Decide Your Destiny book released in 2007.

Publisher's summary
Join the Doctor and Martha on their travels through time and space and influence the story with your decisions. Choose a direction and let the adventures begin...

The space zoo isn't like any zoo you've ever visited on Earth. For a start, some of the animals can talk! Explore the zoo and work out who can be trusted and who has a hidden agenda...

Characters

 * Tenth Doctor
 * Martha Jones
 * Professor Thomas Morrow
 * The Time Crocodile, also known as Trahlen, Ophursis and TA4008
 * The Tortoise (Kyle)