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Doctor Who Companions...
My favourites were Jo Grant, Sarah Jane Smith, Romana and the oh so sexy Adric.

With William Hartnell (November 23, 1963 - October 29, 1966)
Susan Foreman (Carole Ann Ford) (Seasons 1, 2 )
Barbara Wright (Jacqueline Hill) (Season 1-3)
Ian Chesterton (William Russell) (Seasons 1-3)
Vicki (Maureen O'Brien) (Seasons 2, 3)
Steven Taylor (Peter Purves) (Seasons 2, 3)
Katarina (Adrienne Hill) (Season 3)
Sara Kingom (Jean Marsh). (Season 3)
Dorothea "Dodo" Chaplet (Jackie Lane) (Season 3)
Ben Jackson (Michael Craze) (Seasons 3, 4)
Polly (Anneke Wills), (Seasons 3, 4)

With Patrick Troughton (November 5, 1966 - June 21, 1969)
Ben Jackson (Season 4)
Polly (Season 4)
James Robert "Jamie" McCrimmon (Frazer Hines) (Seasons 5, 6)
Victoria Waterfield (Deborah Watling) (Season 4, 5)
Zoe Herriot (Wendy Padbury) (Season 6)

With Jon Pertwee (January 3, 1970 - June 8, 1974)
Liz Shaw (Caroline John) (Season 7)
Josephine "Jo" Grant (Katy Manning) (Season 8-10)
Sarah Jane Smith (Elizabeth Sladen) (Season 11)

With Tom Baker (December 28, 1974 - March 21, 1981)
Sarah Jane Smith (Season 12-4)
Harry Sullivan (Ian Marter) (Season 12)
Leela (Louise Jameson) (Seasons 14, 15)
K-9 Mark I (voice of John Leeson) (Season 15).
K-9 Mark II (voice of John Leeson [Seasons 16 and 18]), voice of David Brierley [Season 17].)
Romanadvoratrelundar ("Romana") (Mary Tamm [Season 16]; Lalla Ward [Seasons 17, 18])
Adric (Matthew Waterhouse) (Season 18)
Nyssa (Sarah Sutton) (Season 18)
Tegan Jovanka (Janet Fielding) (Season 18)

With Peter Davison (March 21, 1981 - March 16, 1984)
Adric (Season 19)
Nyssa of Traken (Seasons 19, 20)
Tegan Jovanka (Seasons 19-21)
Vislor Turlough (Mark Strickson) (Seasons 20-1)
Perpugilliam "Peri" Brown (Nicola Bryant) (Season 21)
Kamelion (voice of Gerald Flood) (Season 20, 21)

With Colin Baker (March 22, 1984 - December 6, 1986) Perpugilliam "Peri" Brown (Seasons 21-23)
Melanie "Mel" Bush (Bonnie Langford) (Season 23)

With Sylvester McCoy (September 7, 1987 - December 6, 1989)
Melanie "Mel" Bush (Season 24)
"Ace" (Sophie Aldred) alias Dorothy. (Seasons 24-6).