After stealing the show in last year's Lego Batman Movie, it was quickly announced that Will Arnett's Batman would be getting his own spin-off.

Since then the project has been slowly accumulating a stellar cast with Ralph Fiennes (Alfred), Rosario Dawson (Batgirl), Michael Cera (Robin) and Zach Galifianakis (The Joker) all signing on.

Now comes the news that Mariah Carey has joined the cast. Although bizarre initial reports claimed that she would be voicing Commissioner Gordon, it has now been confirmed that she will be playing the as yet unnamed Mayor of Gotham.

The spin-off is set to grace our screens on February 10th 2017.