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|Main aliases:||John Crichton|
|Place of origin:||Earth|
|Appearance:||Invasion of the Dinosaurs|
|Main actor:||Terence Wilton|
Mark, formerly known as John Crichton, was a British athlete who jumped 2.6362 metres in one of the Olympic Games. He was one of the people selected by Sir Charles Grover to colonise New Earth. Sarah Jane Smith convinced them that they were not aboard a spacecraft at all. (TV: Invasion of the Dinosaurs)