Cast

• Sigourney Weaver Ellen Ripley
• Winona Ryder Annalee Call
• Dominique Pinon Vriess
• Ron Perlman Johner
• Gary Dourdan Christie
• Michael Wincott Frank Elgyn
• Kim Flowers Sabra Hillard
• Dan Hedaya Gen. Martin Perez
• J.E. Freeman Dr. Mason Wren
• Brad Dourif Dr. Jonathan Gediman
• Raymond Cruz Vincent Distephano
• Leland Orser Larry Purvis
• Carolyn Campbell Carlyn Williamson (Anesthesiologist)
• Marlene Bush Scientist
• David St. James Surgeon
• Rodney Mitchell Soldier with Glove
• Robert Faltisco Soldier Shot Through Helmet
• David Rowe Frozen Soldier
• Garrett House Soldier
• Rod Damer Soldier
• Mark Mansfield Soldier
• Daniel Raymont Soldier
• Cris D'Annunzio Soldier (as Chip Nuzzo)
• Steven Gilborn Voice of 'Father' (voice)
• Robert Bastens Sleeper
• Rico Bueno Sleeper
• Alex Lorre Sleeper
• Ronald Ramessar Sleeper (as Ron Ramessar)
• Nicole Fellows Young Ripley
• Tom Woodruff Jr. Lead Alien
• Joan LaBarbara Newborn Vocal #1 (voice)
• Archie Hahn Newborn Vocal #2 (voice)
• Nito Larioza Sleeper (uncredited)
• Brad Martin Soldier shot by Johner (uncredited)
• David Prior Alien (uncredited) (as David Britten Prior)
• Eddie Yansick Soldier who stuns Ripley (uncredited)

Writers

• Dan O'Bannon
• Ronald Shusett
• Joss Whedon

Producers

• Bill Badalato
• Gordon Carroll
• David Giler
• Walter Hill
• Sigourney Weaver