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Profession	Spy
Organisations worked for	Christine Johnson's Organisation
Appearances	Episode 3.5 (death, only appearance)
Actor/Actress	Mark Leadbetter

"This'll be difficult to explain to the next of kin: good news - he's not technically dead. Bad news - he's turned into a mushroom!"

―James Lester^[src]

Mark Baker was an employee of Christine Johnson who travelled with her and Captain Wilder to the ARC. He was skulking around the ARC when he found the a sample of Future Fungus in Connor's lab. He touched it and was rapidly taken over and turned into a Fungus Creature. The team later killed the Baker creature by turning up the temperature in the room, causing the Baker creature to explode. (Episode 3.5)