Long-running X-Men character Banshee made his film debut in 2011's X-Men: First Class, although with one major change. Banshee, a character with the real name of Sean Cassidy and a codename taken from a creature in Irish folklore, was played by Texas-bred actor Caleb Landry Jones and portrayed as American.

Yet things could have played out very differently, according to Irish actor Robert Sheehan. In a Hot Press interview promoting his role as Simon Lewis in The Mortal Instruments: City of Bones, Sheehan says he was originally cast as First Class' Banshee, but had to back out due to his schedule on the British sci-fi series Misfits.

"I was cast in X-Men," Sheehan says. "I was going to be Banshee, originally an Irish superhero, and Jane Goldman wrote it for me. ... So yeah, that did sting a bit. There was a four- or five-week crossover with Misfits, and the studio came back and said, 'No, we need full and free availability,' and all of a sudden I was un-cast."

The Mortal Instruments: The City of Bones, based on the first novel of Cassandra Clare's young-adult fantasy series, opens Aug. 21. X-Men: Days of Future Past, which apparently doesn't feature Banshee among its sprawling cast, is scheduled for release on May 24, 2014.