There are some connections between the Harry Potter movies and the new series of Dr. Who on the Sci Fi channel.
David Tennant: Hardcore Harry Potter fans may recognize Season 2’s 10th Doctor from “Harry Potter and the Goblet of Fire”, where he played Barty Couch Jr. at the beginning and end of the film. His lip-licking eccentricities certainly helped him prepare to play Season 2’s quirky new Doctor.
Zoe Wannamaker: You may not have noticed her in her first-season Who appearance as Cassandra (she was a sheet of skin stretched over a frame), but check out the younger Cassandra in Season 2’s “New Earth” and you might just recognize the face of Flight Instructor Madame Hooch from Harry Potter and the Sorcerer’s Stone.
Roger Lloyd-Pack: As John Lumic in Dr. Who, he created the mechanical Cybermen and unleashed them on a parallel-universe London. As Barty Couch, Sr. in Harry Potter and the Goblet of Fire, he sent his evil son-played by the current Dr Who!-to Azakaban Prison and was later killed by him!