The trailer shows Amanda Waller (Viola Davis), recruiting the squad to fight Starro, a telepathic starfish.
Gunn's DC supervillains movie features many stars from the original film, such as Margot Robbie as Harley Quinn and Davis as Waller. Jai Courtney plays Captain Boomerang, Joel Kinnaman is Rick Flag, and Jai Courtney as Waller.
John Cena will play Peacemaker, IdrisElba as Bloodsport and Pete Davidson as Blackguard. Alice Braga will portray Sul Soria.
John Ostrander, the creator of "Suicide Squad", appears in the film as Dr. Fitzgibbon.
"The Suicide Squad," which hits theaters August 6, will also be available on HBO Max for 30 consecutive days. (CNN and HBO Max are part of WarnerMedia.