X-Treme X-Men Trivia:
1. In the original X-Men comics, Jean Grey was originally given the codename Marvel Girl. Rachel Summers, daughter of Cyclops and Jean Grey, was also given the codename Marvel Girl.
2. Callistos life is spared after Storm challenged her over the leadership over the Morlocks. However, in X Men: The Last Stand, Storm kills Callisto after their battle at Alcatraz.

3. Wolverine and Sabretooth were experiments during the Weapon X program.
4. Pyro was credited on the 'X2: X-Men United' Official Website as being born in Sydney, Australia.
5. Throughout the comics, Mystique was long-time lesbian lover of Destiny, a mutant who could accurately predict future events, and together they raised adopted child Rogue. Mystique also had a biological child (with Azazel, a demonic mutant), Nightcrawler but abandoned him to be raised by Margali Szardos.

6. Mystiques relationship with Rogue was a reoccuring theme throughout the animated series but was never mentioned in any of the movies.
7. In the battle scene at Alcatraz, Iceman ability to turn his entire body manifests itself. Before this, this was only implied by a previous confrontation of the two.

8. Collosus (Piotr Rasputin) is Russian and had hidden cameos in the first movie before getting larger roles in the second and third.
9. In X-Men: The Last Stand, Magneto is described as a Class Four Mutant and Dark Phoenix as a Class Five Mutant.
10. The main story and plot of X-Men: The Last Stand came from the original comics, written by Chris Claremont with art by Dave Cockrum and John Byrne, The Phoenix Saga and the Dark Phoenix Saga.

Major Cast of X Men, X2: X-Men United, X Men: The Last Stand; Jean Grey/Phoenix (Famke Janssen), Juggernaut/Cain Marko (Vinnie Jones), Cyclops/Scott Summers (James Marsden), Magneto/Erik Lehnsherr (Ian McKellen), Lady Deathstrike/Yuriko Oyama (Kelly Hu), Pyro/John Allerdyce (Aaron Stanford), Angel/Warren Worthington III (Ben Foster), Callisto (Dania Ramirez), Beast/Dr. Henry "Hank" McCoy (Kelsey Grammer), Sabretooth (Tyler Mane), Wolverine/Logan (Hugh Jackman), Storm/Ororo Munroe (Halle Berry), Shadowcat/Kitty Pryde (Katie Stuart), Rogue/Marie (Anna Paquin), Toad (Ray Park), Collosus/Piotr Rasputin (Daniel Cudmore), Mystique/Raven Darkholme (Rebecca Romijn-Stamos), Nightcrawler/Kurt Wagner (Alan Cumming), Iceman/Bobby Drake (Shawn Ashmore), Professor Charles Xavier (Patrick Stewart).

The X Men as they appeared in X-Men: The Animated Series; Phoenix, Juggernaut, Cyclops, Magneto, Lady Deathstrike, Pyro, Angel, Callisto, Beast, Sabretooth, Wolverine, Storm, Jubilee, Rogue, Gambit, Collosus, Mystique, Nightcrawler, Iceman, Professor X. Shadowcat did not appear in this series.