CW has released a new Stargirl trailer which shows how Courtney Whittmore (aka Stargirl) finds the staff of Starman and becomes Stargirl. The latest clip was unveiled on Crisis Aftermath and offers the first look at the upcoming heroes' origin story. The new Stargirl trailer, seen below, shows Brec Bassinger's Stargirl finding the staff of Starman and realizing that her step-dad used to be Starman's sidekick.