The novel “Only Human” by Gareth Roberts was published for the first time in 2005.

The Ninth Doctor wants to bring Rose Tyler and Captain Jack Harkness to Kegron Pluva but the Tardis detects a time distortion caused by a “dirty” time machine. The planned trip has to wait and the Doctor reroutes the Tardis to the Earth at the beginning of the 21st century.

The travelers discover that there’s something strange when they learn that a man dressed like a caveman was involved in a brawl. When they go to the hospital where he was taken, where his presence is covered by a false Ebola alarm, the Doctor realizes that he’s a Neanderthal. Speaking with him, he understands the origin of the time distortion, which must be eliminated to avoid further problems.