Who do you think is the antagonist in Suicide Squad
I'd bet on it being similar to the Dark Knight ending: They finish up the main bad guy, their real target whose been driving the plot of the movie, probably due to having a world-ending chemical weapon. Throughout the movie, they've had a couple Hannibal Lecter style talks with Joker in his cell. Either as a reward for Harley or for his expertise on chemical weapons, if he's made his laughing gas in this continuity (which'd be nice for once). Either way: They've established his character.
Probably be a moment during the finale where they lose communications with Waller, assume the signal's been jammed by the enemy, and they have to decide to either press forward and save the world at risk to themselves, or make a break for it. Will Smith convinces them to press on, they do so, stop the bad guy, whoopee. Cue Waller contacting the group and revealing that communications weren't jammed: They were cut off when the Joker broke out of his cell and tore through the prison, unleashing chaos as he went. While they confronted the bad guy, Joker's already reached the bomb and rigged it to unleash his laughing gas instead. Cue the real grand finale.
So like the Dark Knight: You've got your main bad guy, beat him, then you've got the secondary antagonist who nicely ties things up.
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