'X-Men' stars James Marsden, Rebecca Romijn and more reunite at Comic-Con ahead of 'Avengers: Doomsday' release

More than 25 years after the original 'X-Men' helped launch the modern superhero movie era, the franchise's original stars reunited at San Diego Comic-Con ahead of their highly anticipated return in Marvel Studios' 'Avengers: Doomsday'. The Hall H appearance marked a full-circle moment for longtime fans, bringing together many of the actors who helped turn the 'X-Men' into one of Hollywood's biggest superhero franchises. The gathering comes as Marvel prepares to bring many of those beloved characters into the Marvel Cinematic Universe , marking the culmination of a crossover that has been years in the making.