Supergirl star Katie McGrath compares the heroes and shows of the Arrowverse to Marvel’s The Avengers.
During the series’ first season (when it was still on CBS), the producers managed to connect Supergirl and The Flash in a cross-network, crossover episode.
The first crossover occurred only between Arrow and The Flash in 2014, with the Legends of Tomorrow joining the fold the following year.
This season, they had Supergirl join the rest of the universe’s heroes (from Arrow, The Flash, and Legends of Tomorrow) in a ground-breaking, four-way crossover event.