Companion was a somewhat vague term used to describe the Doctor's closest friends. The Doctor's companions often directly saved the Doctor's lives or provided the Doctor with a perspective that prevented them from abusing their Time Lord powers. On some occasions, they were the proximate reason that the Doctor sacrificed their then-current life and regenerated. On others, they lost their lives in pursuit of the Doctor's goals.
List of Companions[]
| Name | Actor / Actress | Doctors Met | First Appearance | Last Regular Appearance | Last Appearance |
|---|---|---|---|---|---|
| Susan Foreman | Carole Ann Ford | 1; 4; 5; 11; 13 | An Unearthly Child | The Dalek Invasion of Earth | Relative Dimensions |
| Barbara Wright | Jaqueline Hill | 1 | The Chase | The Chase | |
| Ian Chesterton | William Russell | 1; 13 | The Fall of the Doctor | ||
| Vicki Pallister | Maureen O'Brien | 1 | The Rescue | The Myth Makers | |
| Steven Taylor | Peter Purves | 1 | The Chase | The Savages | |
| Katarina | Adrienne Hill | 1 | The Myth Makers | The Daleks' Master Plan | |
| Sara Kingdom | Jean Marsh | 1 | The Daleks' Master Plan | ||
| Dodo Chaplet | Jackie Lane | 1 | The Massacre of St. Bartholomew's Eve | The War Machines | |
| Polly Wright | Anneke Wills | 1; 2 | The War Machines | The Faceless Ones | |
| Ben Jackson | Michael Craze | 1; 2 | |||
| Jamie McCrimmon | Frazer Hines | 2; 6 | The Highlanders | The War Games | The Two Doctors |
| Victoria Waterfield | Deborah Watling | 2 | The Evil of the Daleks | Fury from the Deep | |
| Zoe Heriot | Wendy Padbury | 2 | The Wheel in Space | The War Games | The Five Doctors |
| Liz Shaw | Caroline John | 3; 5 | Spearhead from Space | Inferno | |
| Alistair Gordon Lethbridge-Stewart | Nicholas Courtney | 2; 3; 4; 5; 7; 9; 10 | The Web of Fear | Robot | Time's Collapse |
| John Benton | John Levine | 3; 4 | The Invasion | The Android Invasion | |
| Jo Grant | Katy Manning | 3; 14 | Terror of the Autons | The Green Death | The Rise of Cybus |
| Mike Yates | Richard Franklin | 3 | Planet of the Spiders | ||
| Sarah Jane Smith | Elisabeth Sladen | 3; 4; 5; 6 | The Time Warrior | The Hand of Fear | The Eight Doctors |
| Harry Sullivan | Ian Marter | 4 | Robot | Terror of the Zygons | The Android Invasion |
| Leela | Louise Jameson | 4; 8; 9 | The Face of Evil | The Invasion of Time | Time's Collapse |
| K9 Mark I | John Leeson | 4; 8; 9 | The Invisible Enemy | ||
| K9 Mark II | John Leeson / David Brierley | 4; 8; 9 | The Ribos Operation | Warriors' Gate | Warrior's Gate |
| Romana / Amaron | Mary Tamm / Lalla Ward / Chloë Annett / Annabel Scholey / T'Nia Miller | 4; 8; 9; 10; 11; 12; 13; 15; 16 | The Union of Omega | ||
| Adric | Matthew Waterhouse | 4; 5 | Full Circle | Earthshock | |
| Nyssa | Sarah Sutton | 4; 5; 7 | The Keeper of Traken | Terminus | The Eight Doctors |
| Tegan Jovanka | Janet Fielding | 4; 5 | Logopolis | Resurrection of the Daleks | |
| Vistor Turlough | Mark Strickson | 5 | Mawdryn Undead | Planet of Fire | |
| Kamelion | Gerald Flood | 5 | The King's Demons | ||
| Peri Brown | Nicola Bryant | 5; 6; 3 | Planet of Fire | Mindwarp | The Fall of the Doctor |
| Melanie Bush | Bonnie Langford | 6; 7 | Terror of the Vervoids | Dragonfire | |
| Ace | Sophie Aldred | 7; 8; 10; 15 | Dragonfire | Thin Ice | The Saviour of Gallifrey |
| Raine Cunningham | Julia Ormond | 7; 8 | Crime of the Century | Blood Heat | |
| Bernice Summerfield | Lisa Bowerman | 8; 9; 4 | Love and War | Natural Existence | Children of Earth |
| Chris Hector | Robert Bathurst | 8; 9 | The Zygon Invasion | The Broken Clock | |
| Abigail Norwood | Beverley Cressman | 9 | The Broken Clock | Queen of the Galaxies | The Fall of the Doctor |
| Jean Robinson | Helen Baxendale | 9; 10 | The Smog | Night of the Daleks | |
| Jessica Tyler | Miranda Raison | 10 | Sealed Fates | Time's Collapse | |
| Hannah Ward | Kate Ashfield | 11 | The Night of New Life | The Antitempus | |
| Brian Whiteford | Richard Armitage | 11 | |||
| Ashleigh Chambers | Rosamund Pike | 11 | The Forgotten Christmas | ||
| Sally Ryder | Sheridan Smith | 11; 12; 16 | The Last Humans | Death in Manhattan | The Destiny of Sally Ryder |
| Nikki Williams | Georgia Moffett | 12 | Red Eyes | Hothouse | |
| Ashley Tannen | Freema Agyeman | 12; 13 | The Human Market | The Dawn of Cyberman | |
| Richard McIntyre | Tom Ellis | 12; 13 | The Oncoming Nightmare | The Black Heart | |
| Kelsey Haule | Gemma Chan | 13 | End of the Line | The Fall of the Doctor | |
| Heather McKenzie | Kate Bracken | 14; 15 | The Uprising | The Rise of Cybus | Invasion of the Eyes |
| Felicity Wilson | Joana Borja | 14; 15 | The Raven | Invasion of the Eyes | |
| Joanne Tilley | Rebecca Root | 15; 16 | The Contagion | Human Extinction | The Union of Omega |
| Anderson Stenhouse | Ravin J Ganatra | 15; 16 | The Pendant | ||
| Daniel Neshwin | Ronak Patani | 16 | The Night Crawlers | ? | |