Catavolcus was a warlord who once foughtthe Doctor. Originally a Despot from the third century, he was visited in his dreams by the demonMelanicus, who was sealed in another dimension. Under his instruction, Catavolcus performed a ceremony that allowed him to bring Melanicus back into this dimension and in return the demons bestowed great power upon him as well as the ability to traverse time. Melanicus was eventually banished again byMerlin, leaving Catavolus to roam time and space, pillaging planets. (COMIC:The Tides of Time) He eventually attacked Earth in a future time, intent on obtaining a power source known as the dragon. (COMIC:The Neutron Knights) He also attackedGallifrey some time before its first destruction inthe War againstthe Enemy. (PROSE:The Gallifrey Chronicles)

Catavolcus once attendedBonjaxx's birthday party onMaruthea. (COMIC:Party Animals)

In analternate universe, theTime Lords knew it was a threat they were destined to survive. (PROSE:The Infinity Doctors)