LEGO Batman Movie Sequel That's Never Coming Was Superfriends Meets Justice League Meets Godfather 2 - IGN

While we may never get a sequel to the LEGO Batman Movie, director Chris McKay has shared a few more details about the canceled project that would have been Superfriends meets Justice League meets Godfather 2.

LEGO Batman 2: DC Super Heroes All Cutscenes (Game Movie) 1080p HD

Lego Batman 2: DC Super Heroes first look, Games

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LEGO Movie 2 Acknowledges LEGO Batman Movie, But Ignores Ninjago

Lego Batman Movie, The: Special Edition (2 Disc/DVD) : Will Arnett, Zach Galifianakis, Michael Cera, Rosario Dawson, Ralph Fiennes, Chris McKay, Matthew Ashton, Dan Lin, Jill Wilfert, Will Allegra, Phil Lord

The Dark Knight (film), Ultimate Pop Culture Wiki

Joker in other media - Wikipedia

The Lego Batman Movie 2 - IMDb