CBS, the network behind Supergirl, has revealed the first full trailer for the crossover with The Flash, airing March 28 in the US.
Titled Worlds Finest, the episode sees titular heroine Kara (Melissa Benoist) gain a new ally when the lightning-fast superhero The Flash, aka Barry Allen (Grant Gustin) suddenly appears from an alternate universe. Barry helps Kara battle Silver Banshee, aka Siobhan Smythe (Italia Ricci), and Livewire (Brit Morgan) in exchange for her help in finding a way to return him home.
Fans of the Scarlet Speedster will already be familiar with his experience in alternative universes, having spent a bit of time in Earth 2 recently on the CW series. During Barry’s travel through the breach between world’s, eagle-eyed viewers would have caught a glimpse of Benoist’s Supergirl as a hint of what was to come, including a larger DC Comics multiverse that offered endless possibilities on infinite Earths.
While Supergirl and Superman don’t exist on Barry’s Earth, his ability to travel through time and space means that he’s capable of paying a visit to other DC Comics-based shows (even on other networks apparently) without disrupting anyone’s reality.