Stephan Lee
March 30, 2013 AT 04:47 PM EDT

Just before tonight’s season premiere, the Time Lords at Doctor Who have decided to answer one of the fans’ long-burning questions about the 50th anniversary special. BBC America announced this morning that David Tennant and Billie Piper will join current Doctor and companion, Matt Smith and Jenna-Louise Coleman, in the special, which begins filming this week in the UK. John Hurt of the Harry Potter series will also co-star.

The 50th anniversary will mark the first time Tennant has appeared as the Tenth Doctor since Jan. 1, 2010, and also the first time Piper has appeared in the series since Tennant’s final episode.

Which other former Time Lords and companions are you hoping will return?

Read more:

‘Doctor Who’ stars Matt Smith and Jenna-Louise Coleman talk 50th anniversary special script — EXCLUSIVE VIDEO

How to start watching ‘Doctor Who’: Star Matt Smith and exec producer Steven Moffat suggest some TARDIS entry points

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