Doctor Who: 28 Great Behind The Scenes Shots You Need To See

2. Two Doctors Collide

The worlds of Classic and New Who collided in 2007 when the Tenth and Fifth Doctors came together on screen in the Children in Need special Time Crash. It wasn't the first time they'd met, though, as Peter had previously visited the set during filming on The Christmas Invasion back in 2005.

And now he's David's real life father in law! He just can't stay away, can he?