Batman: The Brave and The Bold the Video Game

OH MY GOD THIS GAME IS SO FUCKING FUN! It's a side-scrolling 2D beat 'em up where you get to play as BATMAN! and company. The dialogue is hilarious, in fact the dialogue and voice-acting are every bit as great as they are in the show and rival Shattered Dimensions' dialogue and voice-acting too. The game is really fun to play as well, give you lots of options for weapons, how to upgrade them, integrate them into combos and whatnot. If you don't feel like playing as Batman you get a team character to play as and a drop-in character that'll wipe out the enemies.

I only finished the first level but the second I get home tomorrow I'm going to end up playing this more and more.

Also, here's the trailer to cement how great it is.