WARNING: SPOILERS

A “Batman v Superman: Dawn of Justice” extra revealed major plot details of Warner Bros.’ upcoming Ben Affleck-Henry Cavill superhero movie during an interview with a local news station.

The individual risks a $5 million fine for breaching the confidentiality agreement required by those who work on the film.

Interest is high in Detroit, Michigan where the highly-anticipated movie has been shooting. On the condition that he stay anonymous, the source broke his confidentiality agreement and spilled what he knew for WILX-10 News, the area NBC affiliate.

Reporter Kirk Montgomery reveals several details he's learned about the movie. At the top of the list is his source's confirmation that Robin a.k.a. Carrie Kelley will be female and played by “Hunger Games: Catching Fire” actress Jena Malone. The actress had been spotted on the set in Detroit.

Additionally, the scene being shot at an Art Museum on the Michigan State University campus involves a fight between Bruce Wayne (Affleck) and Lex Luthor (Jesse Eisenberg). The source also says there will be pyrotechnics-like fireworks, paparazzi covering the event and “heavy special effects.” And, the physical altercation between Bruce and Lex will involve the military.

Batman, Superman & Wonder Woman at Comic Con. Kevin Winter/Getty Images A spokesman for Warner Bros. has not yet returned TheWrap‘s request for comment.

Zack Snyder is returning to direct the movie, which is the centerpiece of the DC Comics universe that Warner Bros. has been building to compete with Marvel. Also set to star are Gal Godot as Wonder Woman, Jason Momoa as Aquaman and Amy Adams reprising the role of Lois Lane.

“Batman v Superman: Dawn of Justice” is set to be released in Spring 2016.

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