OK, I’ve thrown together a quick program with a Zombie chasing Alice through the streets of a little city. He says ‘Brains!’, she yells ‘Oh, Help!’, runs a couple of paces, turns, yells for help again and runs a few paces. All the while, the zombie is following her around the screen and the camera follows the action. 

What I don’t know how to do is program an event that is triggered by the zombie ‘catching’ alice. I’d like to see the zombie get her, turn her into a zombie and the two can go after other characters on the screen.

Help is greatly appreciated.