Doctor Who, Series 4 Episode guide
13/13 As Davros and the Daleks threaten the universe, the Doctor's companions join forces.
First broadcast: 05 Jul 2008
12/13 Earth's greatest heroes assemble to fight the New Dalek Empire.
First broadcast: 28 Jun 2008
11/13 In a nightmare world, Donna and Rose attempt to stop the approaching Darkness.
First broadcast: 21 Jun 2008
10/13 The Doctor is trapped on the planet Midnight, and the knocking on the wall begins...
First broadcast: 14 Jun 2008
9/13 As the shadows rise, the Doctor forges an alliance with the mysterious River Song.
First broadcast: 07 Jun 2008
8/13 The Doctor meets River Song for the first time as he and Donna face the Vashta Nerada!
First broadcast: 31 May 2008
7/13 In 1926, Agatha Christie disappeared for ten days. Was a giant alien wasp to blame?
First broadcast: 17 May 2008
6/13 On the planet Messaline, the Doctor meets the most important woman of his life.
First broadcast: 10 May 2008
5/13 As Sontarans choke the Earth, the Doctor and UNIT battle to keep Martha and Donna alive.
First broadcast: 03 May 2008
4/13 Martha Jones summons the Doctor back to modern-day Earth, but an old enemy lies in wait.
First broadcast: 26 Apr 2008
3/13 On her first alien world, Donna finds the human race has developed dark secrets...
First broadcast: 19 Apr 2008
2/13 It's Volcano Day in Pompeii... Can Donna dare the Doctor to change history?
First broadcast: 12 Apr 2008
1/13 Donna and the Doctor reunite and must save the lives of millions.
First broadcast: 05 Apr 2008