Sigourney Weaver
as Lt. Ellen Louise Ripley
Michael Biehn
as Cpl. Dwayne Hicks
Lance Henriksen
as Lance Bishop
Bill Paxton
as Pvt. William L. Hudson
Jenette Goldstein
as Pvt. Jenette Vasquez
Carrie Henn
as Rebecca "Newt" Jorden
Paul Reiser
as Carter J. Burke
Mark Rolston
as Pvt. Mark Drake
William Hope
as Lt. Scott Gorman
Al Matthews
as Sgt. Al Apone
Colette Hiller
as Cpl. Colette Ferro
Ricco Ross
as Pvt. Ricco Frost
Daniel Kash
as Pvt. Daniel Spunkmeyer
Cynthia Dale Scott
as Cpl. Cynthia Dietrich
Tip Tipping
as Pvt. Tim Crowe
Trevor Steedman
as Pvt. Trevor "Ski" Wierzbowski
Paul Maxwell
as Van Leuwen
Valerie Colgan
as ECA Rep
Alan Polonsky
as Insurance Man
Alibe Parsons
as Med Tech
Blain Fairman
as Doctor
Barbara Coles
as Cocooned Woman
Carl Toop
as Aliens / Alien Queen
John Lees
as Power Loader Operator
Mac McDonald
as Al Simpson
William Armstrong
as Lydecker
Holly De Jong
as Newt's Mother (uncredited)
Eddie Powell
as Alien Warrior (uncredited)
Jill Goldston
as Worker in Corridor (Special Edition) (uncredited)
Jay Benedict
as Newt's Father (uncredited)
Elizabeth Inglis
as Amanda Ripley-Mclaren (uncredited)
Stuart Milligan
as Salvage Team Leader (uncredited)
Bob Sherman
as Salvage Team Leader (voice) (uncredited)
Chris Webb
as Alien Warrior (uncredited)
Tom Woodruff Jr.
as Salvager (uncredited)
Alec Gillis
as Alien (uncredited)