Greg Berlanti has become one of American television's most successful producers, not only with shows like Blindspot, The Mysteries Of Laura and the forthcoming Riverdale, but also in the way that he's cornered the DC superhero market. The growing "Berlantiverse"includes Arrow, The Flash, DC's Legends Of Tomorrow and Supergirl.
In America all four of those shows are airing on the CW (just as they're all airing on Sky1 in the UK). Now that network, having just acquired Supergirl from CBS, has released an extended trailer that brings them all together. This on the heels of the CW's recent announcement that an "epic" crossover between all four shows is in the works. Among those featured in the trailer are Stephen Amell (Green Arrow), Grant Gustin (The Flash), Brandon Routh (The Atom) and Melissa Benoist (Supergirl).