The Flash 3x08 Promo “Invasion!“ (HD) Season 3 Episode 8 Promo - Crossover Event

The Flash 3x08 “Invasion!“ Season 3 Episode 8 Promo - IT’S HEROES VS. ALIENS IN THIS EPIC CROSSOVER EVENT — When aliens called the Dominators attack Central City, Barry (Grant Gustin) speeds over to Star City to ask the Green Arrow (guest star Stephen Amell) for help in stopping them. Realizing the battle against the Dominators is bigger than they thought, they track down the Legends of Tomorrow, and Barry and Cisco (Carlos Valdes) create a breach to bring back a secret weapon – Supergirl (guest star Melis