Warner Bros knows Zack Snyder's Batman v Superman: Dawn of Justice has to kick off their shared universe of films in a big way. Much more than Man of Steel, the new installment will be as focused on world-building as telling a story. A re-introduction to Batman through Ben Affleck and big-screen debuts for Aquaman, Wonder Woman, The Flash, and others are all expected to populate DC's roster of movie heroes.
Meanwhile, David Ayer's Suicide Squad has the task of introducing a line-up of villains and anti-heroes, including the first on-screen appearance of fan-favorite Killer Croc and a re-introduction to the Joker through Jared Leto.
This past week, David Ayer revealed his version of the Clown Prince of Gotham, and now we've learned that Leto's presence in Toronto as the Joker will end up serving both films. A few weeks ago I'd heard murmurs of a flashback sequence that had supposedly been added to Batman v Superman: Dawn of Justice where we'd see Jared Leto's Joker beating and killing Jason Todd, aka Robin. I chose to sit on it until there was more information.
Now a photo has appeared online via Etalk of Ben Affleck in Toronto- which is where Ayer and co. are knee-deep in production- and we’ve been told that Bruce Wayne/Batman will be making an appearance in Suicide Squad. On top of that we've heard that the Batmobile has been spotted in Toronto as well. This adds credence to their being a strong link between Batman v Superman and Suicide Squad.
The idea that the Joker kills one of Batman's Robins comes from the 1988 Batman comic story arc "A Death In The Family," where a reader telephone poll chose Jason Todd's Robin as a victim of the Joker's deadly wrath.
We will also be seeing the Jason Todd Robin costume in a glass casket somewhere on Wayne property, which would possibly trigger this flashback. Regardless of what triggers it, the complete story of how the Joker ended up behind bars at the beginning of Suicide Squad will get explicit context in less than a year: March 25th, 2016.
I've reached out to Warner Bros. Pictures for a comment, but they refuse to say anything at the moment.
More as it develops.