Hey! Well these are your possibilities:
- In the on collision event, if you want the actor to disappear, then either set its transp to 1, and if you want him to restart from somewhere else, you'll only have to set his x and y, and reset transp to 0. You could also DestroyActor, which is good cause when you create him again, then also the On create event happens, which you might want to use...
Or you can say in the collision evet, to change animation - dieing animation, and in the AnimationFinish event of that animation do some of the above...
Have fun with GE!