34. John Barrowman as Captain Jack Harkness
A con man from the 51st century who finds himself helping the Doctor, becoming brave and dependable almost despite himself. Killed by the Daleks, Jack is suddenly brought back to life by Rose, who temporarily possesses control over space and time, and eventually realizes that he is immortal -- Rose made him a "fact" in the universe. Becomes head of Torchwood 3 in Cardiff, tasked with protecting Earth from alien threats by using alien technology. Ninth, Tenth Doctors. Stories as a companion include: "The Empty Child", "The Doctor Dances", "Boom Town", "Bad Wolf", "The Parting of the Ways", "Utopia", "The Sound of Drums", "Last of the Time Lords", "The Stolen Earth", "Journey's End".
33. Bruno Langley as Adam Mitchell
A near-future genius whom Rose befriends and rescues from an exploding bunker, but who tries to take advantage of knowledge encountered in the future and gets sent home by the Doctor, who says it was a mistake to allow Adam aboard. Ninth Doctor. Stories as a companion include: "Dalek", "The Long Game".
32. Billie Piper as Rose Tyler
A 19-year-old shopgirl who stumbles onto a Nestene plot against Earth and eagerly joins the Doctor in his time machine. Ninth, Tenth Doctors. Stories as a companion include: "Rose", "The End of the World", "The Unquiet Dead", "Aliens of London", "World War Three", "Dalek", "The Long Game", "Father's Day", "The Empty Child", "The Doctor Dances", "Boom Town", "Bad Wolf", "The Parting of the Ways", "The Christmas Invasion", "New Earth", "Tooth and Claw", "School Reunion", "The Girl in the Fireplace", "Rise of the Cybermen", "The Age of Steel", "The Idiot's Lantern", "The Impossible Planet", "The Satan Pit", "Love and Monsters", "Fear Her", "Army of Ghosts", "Doomsday", "The Stolen Earth", "Journey's End".
31. Daphne Ashbrook as Dr. Grace Holloway
An emergency room surgeon who operates on the Doctor after he's shot by gang thugs and, thanks to her ignorance of his anatomy, kills him. The regenerated Doctor seeks her out and gains her help in stopping a threat posed by the Master. She decides not to join him in the TARDIS. Eighth Doctor. Stories as a companion include: "Doctor Who: The Movie".
30. Sophie Aldred as Ace
An ordinary girl from Perivale with a boundless enthusiasm and a love for high explosives. Encountered by the Doctor on Iceworld, where she was blown after some sort of cosmic storm. She carries a ghetto blaster and shouts "Ace!" when excited, but discovers young womanhood as the Doctor actively places her in situations that test her character. Still traveling with the Doctor when the original series ends. Seventh Doctor. Stories as a companion include: "Dragonfire", "Remembrance of the Daleks", "The Happiness Patrol", "Silver Nemesis", "The Greatest Show in the Galaxy", "Battlefield", "Ghost Light", "The Curse of Fenric", "Survival".
29. Bonnie Langford as Melanie "Mel" Bush
A perky health nut who pushes the Doctor to exercise and eat right. Her arrival in the Doctor's life is unclear, since she's first seen in a story set in the Sixth Doctor's future. She leaves to travel with the space pirate Glitz. Sixth, Seventh Doctors. Stories as a companion include: "Terror of the Vervoids", "The Ultimate Foe", "Time and the Rani", "Paradise Towers", "Delta and the Bannermen", "Dragonfire".
28. Nicola Bryant as Peri Brown
An American botany student rescued from drowning by Turlough, and then accidentally brought along when Kamelion takes the ship to Sarn. Contrary and strong-minded, she spends much of her time with the Sixth Doctor in perpetual argument, but they are both quite fond of each other. Apparently killed to provide a host for a slug-like villain, though the Time Lord Inquisitor later claims she survived and became a warrior queen. Fifth, Sixth Doctors. Stories as a companion include: "Planet of Fire", "The Caves of Androzani", "The Twin Dilemma", "Attack of the Cybermen", "Vengeance on Varos", "The Mark of the Rani", "The Two Doctors", "Timelash", "Revelation of the Daleks", "The Mysterious Planet", "Mindwarp".
27. Gerald Flood* as Kamelion
A sentient android susceptible to control by the wills of others, and capable of shape-shifting into the human form required of it by whoever is controlling it. Taken from the Master to foil the latter's plot to prevent Magna Carta, Kamelion never freed himself from his link with the Master and in the end brought the Doctor to the Master. Kamelion begged the Doctor kill him as the only way to free himself. The Doctor complied. Fifth Doctor. Stories as a companion include: "The King's Demons", "Planet of Fire".
26. Mark Strickson as Vislor Turlough
Exile from the planet Trion, living as a British schoolboy on Earth. Agrees to help the Black Guardian against the Doctor in exchange for a return home, but balks when he gets to know the Doctor and ultimately rejects the Black Guardian despite the temptation of power. Returns to his people on learning his exile was rescinded. Fifth Doctor. Stories as a companion include: "Mawdryn Undead", "Terminus", "Enlightenment", "The King's Demons", "The Five Doctors", "Warriors of the Deep", "The Awakening", "Frontios", "Resurrection of the Daleks", "Planet of Fire".
25. Janet Fielding as Tegan Jovanka
Australian flight attendant who wanders into the TARDIS after her car suffers a flat nearby. The Doctor seems to find her by turns irritating and bracing (she calls herself "a mouth with legs") but believes she has it in her to keep their group together. Leaves after the bloody encounter with the Daleks. Fourth, Fifth Doctors. Stories as a companion include: "Logopolis", "Castrovalva", "Four to Doomsday", "Kinda", "The Visitation", "Black Orchid", "Earthshock", "Time-Flight", "Arc of Infinity", "Snakedance", "Mawdryn Undead", "Terminus", "Enlightenment", "The King's Demons", "The Five Doctors", "Warriors of the Deep", "The Awakening", "Frontios", "Resurrection of the Daleks".