The sponsor: 604 Republic, makers of find nerd shirts like the one above. They've been awesome enough to award five winners the t-shirt of their choice!
The rules: Three entries per person. Feel free to summarize a bit of the adventure you think the crossover/team-up should be about, although it's not strictly necessary. There's no restrictions in subject matter -- comic characters can join videogame characters, videogame characters can join anime characters, anime characters can join TV series characters, whatever. Winners will be judged on awesomeness and/or hilarity, specifically my interpretation of awesomeness and/or hilarity, which doesn't necessarily have any recognizable relation to popular interpretations of awesomeness and/or hilarity. The contest ends on Monday, March the 12th, at 12:01 am EST.
And that's that. Much, much thanks to the awesome folks of 604 Republic for sponsoring this weekend's contest, and for offering so many prizes, too! You kids have a great weekend, and please, avoid rail travel on any train with a face on it.