I always wanted a Justice League movie to open in a similar way to Spider-Man 2.
You know how it had those hand-drawn segments that recapped the last movie?
Do something like that, but make it give a visual summary of everyone's origin.
Like, it uses pictures to tell the story while booming music plays and all the crew is listed.
>HENRY CAVILL...
>Montage of hand-drawn pictures with fancy transitions; Jor-El and Lara placing baby Kal into the pod, Krypton imploding, Clark growing up in Kansas, discovering his powers, suddenly SUPERMAN!
>transition, background is darker
>*whatever actor is playing Batman*
>Bruce and parents entering Mask of Zorro, them walking in Crime Alley, Joe Chill appears, classic "gripped shirt, flying pearls" shot, young Bruce on his knees next to his parents' bodies, zoom out from the eye to reveal the Batman, shrouded in shadow, tossing Batarangs
>continues as such for each member of the league
I admit, it's inspired by the Justice League intro, but I feel like it'd work rather well in a movie such as this, where everyone is already established.