10 Doctor Who Actors Who Appeared In Star Trek

Most famous as King of the Crossroads and later King of Hell demon Crowley in Supernatural, Mark Sheppard has made an appearance in a number of Sci-Fi staples such as The X-Files, Battlestar Galactica and Firefly.

Popping up in Star Trek: Voyager, Sheppard played Leucon Icheb in the episodes Collective and Child's Play respectively.

Using his son as a human weapon, Leucon and his wife Yifay infected him with anti-Borg pathogens with the hope to stem the invasion. Icheb (named after Sheppard's character) was later rescued by the Voyager crew and returned to his parents, only to have them try again. This time young Icheb was taken from Sheppard Icheb and his wife permanently, staying on Voyager until they reached the Alpha Quadrant (nothing confusing about that is there?)

Joining in on the Government connection, Sheppard played FBI agent Canton Everett Delaware III. Teaming up with the 10th Doctor Matt Smith in The Impossible Astronaut, Delaware helped to protect President Nixon and defeat the memory manipulating Silence.