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Justin Bieber as Batman’s little chum?

Bat-fans, who are already furious at the notion of Ben Affleck as their beloved Dark Knight, got another shock when pop star Bieber suggested he might join Affleck in the upcoming flick “Batman vs. Superman.”

His role? Robin the sidekick.

On Sunday, Twitter was abuzz over the prospect. A few Bieber fans wished the 19-year-old crooner the best. But the sentiment was overwhelmingly against the idea of Bieber as the Boy Wonder, at least online.

Click here for more on the story from The New York Post.

Bieber’s a huge Batman fan — his father even bought him a customized Batbike for his 19th birthday.

On Friday, he posted an Instagram photo of what appeared to be a copy of the movie’s screenplay and added “#Robin” as the hashtag.

Click here for more on the story from The New York Post.