Fantastic Four
I have to admit to not being a huge fan of The Fantastic Four growing up. Heck, I wasn’t a fan of any of the traditional superheroes, though I did like comics in general well enough. I just didn’t want to be reading the same ones as everyone else. So while I was acquainted with the basic premise, I didn’t have too much attachment to it. I completely understand that someone who was in love with the story may have ideas that are completely shattered if the movie wasn’t faithful to the original story.
When the four primary characters travel to the space station to research cosmic rays, they find that their calculations were off, and the rays are both more powerful than expected and closer. So they are bombarded by radiation that is unknown in origin and in power. This in turn gives them new powers, and they return to Earth with these powers, which transforms them into the superhero team that is known as The Fantastic Four.