20th Century Fox



It's been ten years since Hugh Jackman's Wolverine got his first solo movie. Few would argue that "X-Men Origins: Wolverine" was a high point for the franchise, but without it we never would have gotten future gems like "Logan." Celebrate this mutant milestone by learning some fun facts about the making of "X-Men Origins: Wolverine" and the spinoffs that never were.

1.Liev Schreiber refused to wear a padded muscle suit, instead relying on Jackman's help to bulk up before filming. Schreiber eventually gained 40 pounds by following Jackman's exercise regimen and protein-heavy diet.

2. Director Gavin Hood repeatedly clashed with producers and studio executives over the tone and direction of the film, particularly his desire to portray Wolverine as a military veteran with PTSD.

20th Century Fox



3.Kodi Smit-McPhee was originally cast as the young James Howlett, but had to drop out due to his commitment to 2009's "The Road." Smit-McPhee would instead make his X-Men debut as Nightcrawler in 2015's "X-Men: Apocalypse."

4. Though it was deleted from the theatrical version, one of the scenes in the Nigeria sequence features a young Storm working as a child slave laborer.

5. While it draws heavily from Marvel's X-Men comics, the movie does make some changes to the source material. In the comics, Wolverine isn't old enough to have fought  in the Civil War, and he and Sabretooth aren't actually brothers.

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6.Brian Cox expressed interest in reprising his role as Col. Stryker. But due to the expense of the de-aging technology used on Patrick Stewart's Charles Xavier, it was decided to cast Danny Huston as a young Stryker instead.

7.Kevin Durand's Blob suit was so bulky and hot that a system of tubes had to be installed in order to pump in ice water and keep Durand cool.

20th Century Fox



8. While Ryan Reynolds plays Deadpool in the first act of the film, he was replaced by stuntman Scott Adkins for most of the the Weapon XI scenes. Reynolds does appear as Weapon XI in a handful of close-up shots.

9. An unfinished work print cut of the film leaked online a month before its release. Fox estimated the file was downloaded 4.5 million times by the time the finished version hit theaters and blamed the leak for the film's lackluster box office numbers.

10. Originally, Fox intended to launch an entire series of "X-Men Origins" prequel movies. These projects were canceled, and portions of the planned "X-Men Origins: Magneto" were instead used for 2011's "X-Men: First Class."

Activision



11. Activision released a video game adaptation that included significant plot elements not in the movie. For example, one section features Wolverine teaming up with Mystique to destroy the Sentinel program.

12.Will.i.am eagerly agreed to play John Wraith because of his love for another mutant teleporter, Nightcrawler. In fact, the video game version implies that Wraith is Nightcrawler's father, though later movies revealed that the villain Azazel is actually his father.

Warner Bros.



13. Before the release of "X-Men Origins: Wolverine," Christopher Reeve held the record for the most times the same actor has played a superhero character. Jackman and Patrick Stewart both tied that record thanks to this film, and eventually went on to reprise their roles as Wolverine and Professor X several more times.