'Suicide Squad' -- Oh Yeah ... Batman Is Definitely In It! (PHOTO)

It wouldn't be a party if Batman wasn't invited, and now it's official ... the Caped Crusader is going to be in "Suicide Squad."

While the Batmobile had previously been spotted on set, Wednesday marked the first time Bruce Wayne's alter ego made an appearance.

Ben Affleck's stunt double was strapped to the roof of a car as Jared Leto's Joker stunt double sat in the driver's seat ... during filming in Toronto.

Also on set -- the actual Margot Robbie. That's her in full Harley Quinn makeup riding shotgun.