Guest Stars: Chris Phillips as Himself (Professor, Imperial College, London) | Kevin Warwick as Himself (Professor, University of Reading) | Kurt Braunohler as Himself (Comedian) | Godfrey as Himself (Comedian) | Natalie Morales (2) as Herself (Actor) | Alison Haislip as Herself (Actress, G4 Correspondent) | Jim Al-Khalili as Himself (Theoretical Physicist) | Scott Adsit as Himself (Actor, Comedian) | Steven Moffat as Himself (Show Runner, Doctor Who) | Michio Kaku as Himself (Theoretical Physicist) | Maggie Aderin Pocock as Herself (Space Scientist) | Chloe Dykstra as Herself (Actor) | Dallas Campbell as Himself (Actor, Screenwriter)

Guest Stars: Peter Davison as Himself | Scott Adsit as Himself | Chris Hardwick as Himself | Alison Haislip as Herself | Steven Moffat as Himself | Eugene Mirman as Himself | Jack Shepherd (2) as Himself (Writer, Buzzfeed) | Reggie Yates as Himself | Toyah Willcox as Herself | Jonah Ray as Himself | Josie Long as Herself | Adam Rogers as Himself | Tracy-Ann Oberman as Herself | Rhys Thomas as Himself | Jon Culshaw as Himself | Natalie Morales (2) as Herself | Chloe Dykstra as Herself

Guest Stars: Adam Rogers as Himself | Chris Hardwick as Himself | Chloe Dykstra as Herself | Peter Davison as Himself | Rhys Thomas as Himself | Steven Moffat as Himself | Eugene Mirman as Himself | Reggie Yates as Himself | Toyah Willcox as Herself | Scott Adsit as Himself | Tracy-Ann Oberman as Herself | Jack Shepherd (2) as Himself | Alison Haislip as Herself | Josie Long as Herself | Natalie Morales (2) as Herself | Jon Culshaw as Himself | Jonah Ray as Himself

Interviewees: Tracy-Ann Oberman as Herself | Toyah Willcox as Herself | Chloe Dykstra as Herself | Peter Davison as Himself | Josie Long as Herself | Eugene Mirman as Himself | Reggie Yates as Himself | Jack Shepherd (2) as Himself | Alison Haislip as Herself | Jonah Ray as Himself | Chris Hardwick as Himself | Jon Culshaw as Himself | Scott Adsit as Himself | Natalie Morales (2) as Herself | Rhys Thomas as Himself | Adam Rogers as Himself

Guest Stars: Tom Ward as Captain Latimer | Richard E. Grant as Dr Simeon (Walter Simeon) | Catrin Stewart as Jenny | Neve McIntosh as Madame Vastra | Dan Starkey as Strax | Joseph Darcey-Alden as Digby | Ellie Darcey-Alden as Francesca | Liz White as Alice | Jim Conway (2) as Uncle Josh | Cameron Strefford as Walter | Annabelle Dowler as Walter's Mother | Ben Addis as Bob Chilcott | Sophie Miller-Sheen as Clara's Friend | Daniel Hyde as Lead Workman | Ian McKellen as Great Intelligence | Juliet Cadzow as Ice Governess

Guest Stars: Jenna-Louise Coleman as Oswin | Anamaria Marinka as Darla (as Anamaria Marinca) | Naomi Ryan as Cassandra | David Gyasi as Harvey | Nicholas Briggs as Daleks | Barnaby Edwards as Dalek 1 | Nicholas Pegg as Dalek 2

Guest Stars: Rupert Graves as Riddell (John Riddell) | Mark Williams as Brian Williams | David Bradley as Solomon | Riann Steele as Queen Nefertiti | Sunetra Sarker as Indira | Noel Byrne as Robot 1 | Richard Garaghty as Robot 2 | Richard Hope as Bleytal | Rudi Dharmalingam as ISA Worker | David Mitchell as Robot 1 | Robert Webb (2) as Robot 2

Guest Stars: Andrew Brooke as The Gunslinger | Adrian Scarborough as Kahler-Jex | Dominic Kemp as Kahler-Mas | Joanne McQuinn as Sadie | Byrd Wilkins as The Preacher | Garrick Hagon as Abraham | Ben Browder as Isaac | Sean Benedict as Dockery | Rob Cavazos as Walter

Guest Stars: Mark Williams as Brian Williams | Jemma Redgrave as Kate Stewart | Steven Berkoff as Shakri | Selva Rasalingam as Ranjit | Alice O'Connell as Laura | Peter Cartwright as Arnold Underwood | David Beck as Orderly #1 | Daniel Beck as Orderly #2 | David Hartley (1) as UNIT Researcher

Songs: David Guetta Feat Sia Furler -- Titanium

Guest Stars: Alex Kingston as River Song | Michael McShane as Grayle (Julius Grayle) | Rob David as Sam Garner | Bentley Kalu as Hood | Ozzie Yue as Foreman | Burnell Tucker as Old Garner | Zac Fox as Photoshoot PA

Songs: Sting -- Englishman In New York

Guest Stars: Manpreet Bachu as Nabile | Sean Knopp as Paul | James Greene as The Abbott | Eve De Leon Allen as Angie (Angie Maitland) | Kassius Carey Johnson as Artie (Artie Maitland) | Geff Francis as George (George Maitland) | Celia Imrie as Miss Kizlet | Robert Whitelock as Mahler | Dan Li as Alexei | Daniella Eames as Little Girl | Anthony Edridge as Pilot | Fred Pearson as Barista | Jade Anouka as Waitress | Olivia Hill as Newsreader | Matthew Earley as Man With Chips | Isabella Blake-Thomas as Child Reading Comic | Richard E. Grant as The Great Intelligence

Guest Stars: Michael Dixon as Dave (Dave Oswald) | Nicola Sian as Ellie (Ellie Ravenwood) | Emilia Jones as Merry (Merry Galel) | Chris Anderson as The Chorister (Chorister Razbeketh) | Aidan Cook as The Mummy | Karl Greenwood as Dor'een

Guest Stars: Liam Cunningham as Captain Zhukov | David Warner (1) as Professor Grisenko | Tobias Menzies as Lieutenant Stepashin | Josh O'Connor as Piotr | James Norton as Onegin | Charlie Anson as Belevich | Spencer Wilding as Skaldak | Nicholas Briggs as Skaldak

Guest Stars: Dougray Scott as Alec Palmer | Jessica Raine as Emma Grayling | Kemi-bo Jacobs as Hila (Hila Tarcorian) | Aidan Cook as The Crooked Man

Guest Stars: Ashley Walters as Gregor Van Baalen | Mark Oliver (2) as Bram Van Baalen | Jahvel Hall as Tricky (Tricky Van Baalen) | Sarah Louise Madison as Time Zombie | Ruari Mears as Time Zombie | Paul Kasey (1) as Time Zombie

Guest Stars: Diana Rigg as Mrs Gillyflower (Winifred Gillyflower) | Rachael Stirling as Ada | Dan Starkey as Strax | Catrin Stewart as Jenny Flint | Neve McIntosh as Madame Vastra | Eve De Leon Allen as Angie (Angie Maitland) | Kassius Carey Johnson as Artie (Artie Maitland) | Brendan Patricks as Edmund & Mr. Thursday | Graham Turner as Amos | Olivia Vinall as Effie | Michelle Tate as Abigail | Scott Stevenson (1) as Dipper | Jack Oliver Hudson as Thomas Thomas

Guest Stars: Eve De Leon Allen as Angie (Angie Maitland) | Kassius Carey Johnson as Artie (Artie Maitland) | Jason Watkins as Mr Webley | Tamzin Outhwaite as Captain | Warwick Davis as Porridge | Eloise Joseph as Beauty | Will Merrick as Brains | Zahra Ahmadi as Missy | Calvin Dean as Ha-Ha | Aidan Cook as Cyberman | Nicholas Briggs as Cybermen

Guest Stars: Alex Kingston as River Song | Richard E. Grant as Dr Simeon | Neve McIntosh as Vastra | Catrin Stewart as Jenny (Jenny Flint) | Dan Starkey as Strax | Eve De Leon Allen as Angie (Angie Maitland) | Kassius Carey Johnson as Artie (Artie Maitland) | Nasi Voutsas as Andro | David Avery as Fabian | Michael Jenn as Clarence (Clarence DeMarco) | Rab Affleck as Archie | Samuel Irvine as Messenger Boy | Sophie Downham as Young Clara | Paul Kasey (1) as Whisper Man | John Hurt as The Doctor (and Introducing)