The marketing campaign for Supergirl is finally kicking off, as Warner Bros. and DC Studios have released a new poster and a countdown to the film's trailer launch. Supergirl is the next entry in James Gunn's DCU following the blockbuster hit, Superman. The 2025 filmoffered a brief tease of Milly Alcock as Kara Zor-El, setting the stage for her feature film, which is set to open in theaters on June 26, 2026.