The X-Men once teamed up with Brigadier Lethbridge-Stewart, the Doctor's longest-running friend and ally in Doctor Who. British TV shows like Doctor Who and The Avengers have actually had a massive impact on Marvel Comics. The X-Men's Hellfire Club was inspired by Britain's Avengers, with legendary comic book writer Chris Claremont loving the idea when he saw it in an episode of the TV series.
Even Doctor Who has a history with Marvel Comics — because Marvel actually acquired the rights to publish comic books starring the enigmatic time traveler for several years. They never quite integrated the Doctor and his enemies into their own universe; the closest they came was a Death's Head series in which the Doctor left the bounty hunter stranded on top of the Baxter Building. But there was actually one subtle cameo in Uncanny X-Men #218.
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Written by Claremont and featuring art by Mark Sylvestri and Dan Green, Uncanny X-Men #218 saw the mutants tangle with the Juggernaut in the U.K. As battle raged, the police called on Brigadier Lethbridge-Stewart — who arrived to help the X-Men clear up the chaos when the battle was over, along with Sergeant-Major Benton. The names will be familiar to any fans of Doctor Who; Lethbridge-Stewart was one of the Doctor's greatest friends and allies, played by Nicholas Courtney. He was in charge of UNIT, the United Nations Intelligence Taskforce, and Benton was one of his highest-ranking agents. Although colorist Glynis Oliver changed the Brigadier's hair-color, it wasn't hard to get the reference.
The cameo is an amusing one, not least because it's hard to imagine even UNIT having equipment that could hold the Juggernaut
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