5) Jenna Coleman
After playing Clara Oswald – one of the Doctor’s longest-running time-travelling companions – on Doctor Who for several seasons, Jenna Coleman is a natural at acting in period roles. It’s fitting, then, that the actresses’ small appearance in the MCU came in the wartime-set Captain America: The First Avenger.
Jenna appears in the fairground scene where a pre-serum Steve Rogers, Bucky Barnes and their dates witness Howard Stark’s invention expo. She doesn’t get much to do, but Jenna still nabs a couple of lines as Bucky’s unnamed date.
She’s far from the only Doctor Who alum to appear in the MCU, though. The actress is also joined by the likes of fellow companion Karen Gillan (Guardians of the Galaxy) and two incarnations of the Time Lord in Christopher Eccleston (Thor: The Dark World) and David Tennant (Jessica Jones).