Place of origin:
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He had once gone to Australia on holiday and had sent Ace a postcard saying how lonely he felt so far from home. (Timewyrm: Revelation)
One summer during the 1980s, Midge became obsessed with Dungeons & Dragons. (Gods and Monsters)
In 1989, Midge was transported from Earth to the Cheetah World by a Kitling, where he had to survive along with others who had teleported there. While being coerced by the survival trainer Paterson, he became infected with the Cheetah Virus. The Master, having been trapped on the Cheetah World, used him to teleport to Earth. The Master then instructed Midge to engage the Seventh Doctor in a duel on his chosen transport, a motorcycle. The collision caused a large explosion, injuring him, but the Doctor survived. The Master killed Midge for his failure. (Survival)
Behind the scenes
Midge was the final human to die in the original series. The Cheetah Person, Karra, was the last character to die in the original series, being killed minutes after Midge.
After filming the actor portraying the character of Midge. Will Barton, went into a newsagents with his cheetah contacts still in and freaked out some customers