For months, DC Studios knew the film wasn't working. Things came to a head in March when the studio tested its own cut against one from filmmaker Craig Gillespie.

'Supergirl' director Craig Gillespie and screenwriter Ana Nogueira explain their choices for the film's ending.

For months, DC Studios knew the film wasn't working. Things came to a head in March when the studio tested its own cut against one from filmmaker Craig Gillespie.