The series, which stars Arthur Darvill as Rip Hunter, follows the time-traveler as he is tasked with assembling a group of heroes and villains to confront an unstoppable threat, where both the planet and time itself is at stake.
Also appearing in the new series will be Victor Garber, Brandon Routh, Caity Lotz, Wentworth Miller, Dominic Purcell, Ciara Renee, and Franz Drameh. Each one either reprising their characters from Arrow and The Flash, or starring as new characters for the series, such as Renee's Hawkgirl.
So, at the very least The Atom, the first Black Canary, Captain Cold, Heatwave, Rip Hunter, Hawkgirl and one half of Firestorm are heading up this team. Drameh's character is the only mystery remaining, here's how the casting rumors described his part:
“MYSTERY HERO” | An African-American male in his twenties will fill the role of a regular, street smart guy who unexpectedly gains powers, and then, as part of the team, regularly quips about the insanity of the situations.
Source: USA Today