Sadly, Alan Cumming's devilish, teleporting Nightcrawler never appeared in another X-Men film after his debut in the second, the star of a particularly thrilling opening sequence. Apparently Cumming and the crew alike just weren't up for the arduous make-up process for a character that wouldn't appear on screen that much, and his absence was actually explained in a video game of all things. Before he decided to retire from the X-Men because he didn't like all the violence they got involved with, Nightcrawler was the host to a couple of fun little Easter eggs. The music in that opening attack on the White House is "Dies Irae" from Mozart's Requiem because Cumming shares a birthday with the composer. And Nightcrawler's real name, Kurt Wagner, is shared with the singer/songwriter of the band Lambchop, with the character quoting several lyrics in his dialogue.