The name of the show was a reference to the popular fictional television show The X-Files. Each episode (there were six in all, each lasting 30 minutes) 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.
The show parodied the popular television science fiction program The X-Files, which was particularly popular at the time. The name The X Creatures is an obvious pun on The X-Files, as was the title sequence. Chris Packham also has a facial resemblance to The X-Files star David Duchovny.