Some actors have appeared in many more.
Guy Siner has worked acrossDoctor Who,Star Trek,Star WarsandBabylon 5!
But lets stick toWhoandTrekfor now…
Here then, in alphabetical order, are ten actors to have crossed the divide.
Some years later, John appeared inStar Trek: The Next Generationas Macias in an episode calledPre-Emptive Strike.
Barrie Ingham
Barrie Ingham appeared opposite William Hartnell as Paris in theDoctor WhostoryThe Myth Makers.
He was seen alongside Peter Cushing as Alydon in the filmDoctor Who and The Daleks.
Much later he was seen inStar Trek: The Next GenerationepisodeUp The Long Ladderas Daniel Odell.
Christopher Neame
In 1980 Christopher Neame appeared inDoctor Whoas the alien Skagra in the Douglas Adams-scriptedShada.
Deep Roy
InDoctor Who, Deep played the role of Mr Sin inThe Talons Of Weng-Chiang.
Mark Sheppard
Mark appeared in the most recent series ofDoctor Whoas Canton Delaware inThe Impossible AstronautandDay Of The Moon.
A few years earlier, theBattlestar Galacticaactor was seen as Leucon in theStar Trek: VoyagerepisodesCollectiveandChilds Play.
Guy Siner
Guy Siner is perhaps best known as Lieutenant Hubert Gruber inAllo Allo.
Siner has many sci-fi roles to his name.
InDoctor Who, he appeared as Ravon in the classic Tom Baker storyGenesis Of The Daleks.
He was Stuart Reed in theEnterpriseepisodeSilent Enemy, his credits also includeBabylon 5and severalStar Warsvideo games.
David Warner
Acclaimed character actor David Warner has several connections to theDoctor Whofranchise.
In 1976 his character was memorably and shockingly decapitated inThe Omen, which featured Patrick Troughton as a priest.
His voice was heard in theDoctor WhoanimationDreamlandin 2009.