Danielle Campbell as TESSA MERLYN
"StarNight"

Grant Gustin as BARRY ALLEN
"Flash"

Hailee Steinfeld as TAYLOR ALLEN
"Speedy"

Tom Holland as THOMAS ALLEN
"Impulse"

Danielle Panabaker as CAITLIN SNOW
"Killer Frost"

Carlos Valdes as CISCO RAMON
"Vibe"

Stephen Amell as OLIVER QUEEN
"Green Arrow"

Emily Bett Rickards as FELICITY SMOAK
"Overwatch"

David Ramsey as JOHN DIGGLE
"Spartan"

Jesse Lee Soffer as JAY HALSTEAD

Tracy Spiridakos as HAILEY UPTON

Florence Pugh as IVY HALSTEAD
"White Canary"

Tom Cavanagh as SHERLOQUE WELLS / HARRY WELLS / EOBARD THAWNE

Jesse L. Martin as JOE WEST

Hartley Sawyer as RALPH DIBNY
"Elongated Man"

Melissa Benoist as KARA DANVERS
"Supergirl"

Jack Moore & Ben Lewis as WILLIAM CLAYTON

Katherine McNamara as MIA SMOAK
"Blackstar"

Matthew Daddario as ALEC FOSTER

And:
Caity Lotz as SARA LANCE
"White Canary"

Special Guest Star:

Sadie Soverall as CIRCE

Summer Fontana as AVERY FOSTER

Colton Haynes as ROY HARPER
"Arsenal"

Chris Wood as MON-EL

Chyler Leigh as ALEX DANVERS

Katie Cassidy as LAUREL LANCE
"Black Siren"

Tyler Hoechlin as CLARK KENT
"Superman"