Actors from Harry Potter in Doctor Who

I hope people know about david tennant :P

I'm freaking out.... 2 of my favorite tv shows/ movies!!

Oh cool

Madam Hooch is CASSANDRA!? Omg what is this mindfuckery.

Oh my god I didn't realize Tennant was.... my jaw literally dropped! Holy shit!

Oh! And you're missing Roger Lloyd Pack who played Barty Crouch in Harry Potter and John Lumic in Doctor Who :)

Bad things happen to wizards that mess time, Harry.

Mister Olivander was the war doctor. you forgot that one.

Or characters from Doctor Who that featured in Harry Potter

Woah who did David tennant play?

huh...did not know David was in harry potter...never really got into harry potter