When "The LEGO Batman Movie" opens next February, the film will feature a mini "Arrested Development" reunion of sorts. Will Arnett and Michael Cera, who played GOB and George Michael Bluth on the cult classic sitcom, will voice the Dynamic Duo -- Batman and Robin. Now, thanks to a report on CinemaCon from The Wrap, we know how the Caped Crusader and Boy Wonder will meet in the upcoming animated feature film.

"Imagine 'The Lego Movie' credits rolling and we pickup with Batman back at the Batcave," joked Arnett, who was on hand at CinemaCon to introduce the clip. "What's his day-to-day? Sure, his parents were murdered in front of him but why's he so bummed out?"

The clip then rolled, revealing that Bruce Wayne accidentally adopts Dick Grayson during a fancy gala. "I thought I was being sarcastic," Bruce says to Alfred (Ralph Fiennes) in the clip. Grayson then enters the Batcave and immediately starts grabbing Batman's gear, exclaiming that they "could have sleepovers every night!" The nerdy kid stumbles upon Batman's collection of costumes, trying on a bunch until landing on what Batman called his "Reggae Man" disguise. After Grayson makes a few tweaks, like ripping off the red and green costume's pants, he's ready to sidekick in his classic Robin duds.

If this clip has you hankering for more "LEGO Batman" action, you can check out the teaser below.

Starring Will Arnett, Michael Cera, Zach Galifianakis, Rosario Dawson and Ralph Fiennes, "The LEGO Batman Movie" opens on February 10, 2017.