Actors who were offered a role but turned it down. These are not my choices so you can disagree if you want.
Cyclops - X-Men (2000).
Known for: The Thin Red Line (1999), The Count Of Monte Cristco (2002) and Madison (2005).
Known for: Terminator (1984), Aliens (1986) and The Abyss (1989).
Michael Biehn and Jim Caviezel were originally offered for the part of Cyclops. Both eventually turned down the role.
The Role Went To: James Marsden.
Catwoman - Batman Returns (1992)
Known for: Dune (1984), No Way Out (1987) and Ace Ventura: Pet Detective (1994).
Known For: Goldeneye (1995), X-Men (2000) and X-Men 2 (2003).
Sean Young and Famke Janssen were originally offered the role for Catwoman. They turned down the role for unknown reasons.
The Role Went To: Michelle Pfeiffer.
Lex Luthor - Superman Returns (2006)
Known for: Tombstone (1993), Tales Of The Crypt: Demon Knight (1995) and Zoolander (2001).
Known for: Star Trek: First Contact (1996), Minority Report (2002) and Silent Men (2005).
Billy Zane and Neal Mcdonough were originally offered the role of Lex Luthor. They turned it down due to the disappointment of the script.
The Role Went To: Kevin Spacey.
Norman Osborn/The Green Goblin - Spider-Man (2002)
Known for: Grease (1979), Pulp Fiction (1994) and Face/Off (1997).
Known for: Aliens (1986), Hard Target (1993) and Dead Man (1996).
Known for: Se7en (1996), L.A Confidential (1997) and American Beauty (1999).
John Travolta, Lance Henriksen and Kevin Spacey were offered the role of Norman Osborn/The Green Goblin and all three lost out to Willem Dafoe.
The Role Went To: Willem Dafoe.
Trivia: Lance Heriksen as cast as Norman Osborn in James Camerons's cancelled Spider-Man project.
Dr. Victor Von Doom/Doctor Doom - The Fantastic Four (2005)
Known for: Die Hard (1988), Robin Hood (1991) and Galaxy Quest (1999).
Known for: Die Hard With A Vengeance (1995), Man In The Iron Mask (1998) and Dungeons Of Dragons (2000).
Known for: Event Horizon (1997), The Partiot (2000) and Harry Potter And The Chamber Of Secrets (2003).
Alan Rickman, Jeremy Irons and Jason Isaacs were considered the role but lost out to Julian McMahon due to the script.
The Role Went To: Julian McMahon.
Ra's Al Ghul - Batman Begins (2005)
Known for: Lord Of The Rings (2001 - 2003) and A History Of Violence (2005).
Turned down the role of Ra's Al Ghul.
The Role Went To: Liam Neeson.
Magneto - X-Men (2000)
Known for: Superman II (1980), The Limey (1999) and Revelation (2001).
Terence Stamp was considered for Magneto but lost out to Ian McKellen.
The Role Went To: Ian McKellen.
Let me know what you guys think.