TV Doctor Who - Season 4 Episode 5 : The Poison Sky (2) Doctor Who - Season 4 Episode 5 : The Poison Sky (2) 7.576/10 by 3245 users The Sontarans continue their evil plot and begin to "choke" the Earth. The Doctor and Donna, now teamed with Martha have to stop them! Can they save Earth before it's too late? Details Casts Posters Images Title Doctor Who - Season 4 Episode 5 : The Poison Sky (2) Alternative Titles Доктор Ху, 神秘博士, دكتور هو, Docteur Who, Dr Who, Doctor Who (2005-2022), 超時空奇俠, דוקטור הו, 닥터후, Doktor Hu, Доктор Что First Air Date 2005-03-26 Last Air Date 2021-12-05 Number of Episodes 153 Number of Seasons 13 Genres Action & Adventure, Drama, Sci-Fi & Fantasy, Networks BBC One, Casts Jodie Whittaker, Mandip Gill, John Bishop, Billie Piper Plot Keywords , The Doctor Jodie Whittaker Yasmin 'Yaz' Khan Mandip Gill Dan Lewis John Bishop Rose Tyler Billie Piper Episodes List Doctor Who Season 4 :Episode 1 Partners in Crime Partners in Crime 2008-04-05 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a... Doctor Who Season 4 :Episode 2 The Fires of Pompeii The Fires of Pompeii 2008-04-12 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a... Doctor Who Season 4 :Episode 3 Planet of the Ood Planet of the Ood 2008-04-19 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a... Doctor Who Season 4 :Episode 4 The Sontaran Stratagem (1) The Sontaran Stratagem (1) 2008-04-26 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a... Doctor Who Season 4 :Episode 5 The Poison Sky (2) The Poison Sky (2) 2008-05-03 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a... Doctor Who Season 4 :Episode 6 The Doctor's Daughter The Doctor's Daughter 2008-05-10 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a... Doctor Who Season 4 :Episode 7 The Unicorn and the Wasp The Unicorn and the Wasp 2008-05-17 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a... Doctor Who Season 4 :Episode 8 Silence in the Library (1) Silence in the Library (1) 2008-05-31 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a... Doctor Who Season 4 :Episode 9 Forest of the Dead (2) Forest of the Dead (2) 2008-06-07 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a... Doctor Who Season 4 :Episode 10 Midnight Midnight 2008-06-14 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a... Doctor Who Season 4 :Episode 11 Turn Left Turn Left 2008-06-21 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a... Doctor Who Season 4 :Episode 12 The Stolen Earth (1) The Stolen Earth (1) 2008-06-28 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a... Doctor Who Season 4 :Episode 13 Journey's End (2) Journey's End (2) 2008-07-05 The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a...