New bonus features reveal fun moments between Supergirl and Superman. The behind-the-scenes photos show Supergirl star Milly Alcock and Superman actor David Corenswet sharing fun moments together while filming. Supergirl’s Digital Release shows a goofy side of David Corenswet’s SupermanWarner Bros. released Supergirl on Digital recently. The pictures show Milly Alcock and David Corenswet having fun together. A different picture shows Corenswet making funny faces for laughs.