Look who's back!

Is Jeff Collier a Time Lord in disguise? Well he, or at least the lovely Matt Bardock, who until recently played him on Casualty, seems to have cheated death.

It seems he is teaming up with the good Doctor's assistant Clara (Jenna Coleman) this Saturday from 8.25pm.

Matt plays Al in the latest episode of Doctor Who - the rather medical-sounding Flatline. In it, Clara goes against an enemy that exists beyond human perception.

And, of course, we're sure you'll want to stay tuned to BBC One straight after Doctor Who for this week's episode of Casualty. The Index Case starts at 9.10pm, followed by the first of two online exclusives- Radio Holby Part 1- right here on the official website.