In a supremely cute crossover, the Helghast from Killzone 2 are playable in the upcoming Hot Shots Tennis: Get a Gripfor Sony PlayStation Portable. Sony Computer Entertainment America producer Chris Hinojosa-Miranda hinted at additional unlockable characters on a PlayStation Blog post. As a huge fan of the Mario Tennis series, I'm really looking forward to this PSP game and am very curious about the other unlockable characters.