Man, the internet will go to any length to track down information on the things it loves. The love-object of the day: Portal 2, the sequel to Valve's innovative puzzle game Portal. The internets unique source of information: A casting notice from Breakdown Express, an L.A. casting website.
The warning: HUGE, HONKING SPOILERS AHOY!!! Details of perhaps a major character in Portal 2 are under the cut.
Are you sure you want to know who may be be-deviling you in the next Portal? Okay...
It's billionaire industrialist Cave Johnson, the creator of Apeture Science! The rest of the casting notice is reproduced below: