Of all the species that have ever existed, 99.9% are now extinct. This documentary brings to life the compelling stories of these lost creatures and solves the mystery of their demise.

The X Creatures is a British documentary television series that was produced by the BBC in 1998, which was broadcast in 1999 on BBC 1. It was presented by Chris Packham, and examined the possibility of the existence of cryptozoological creatures.

The name of the show was a reference to the popular fictional television show The X-Files. Each episode involved Chris Packham travelling to a certain place on Earth where the creature supposedly exists, and examining eye witness accounts, as opposed to searching for the creature. No VHS or DVD releases were ever made.