30 seconds 3d animation short skit

For this project we are to animate a 30 seconds short skit...The story i am going for is; an alien (already rigged alien will be provided) comes from space and he came to earth (park scenes already modeled) he does a front flip off his spaceship, when he gets to the floor, he realizes that there is a worm moving and he zaps the worm out of fear, then he hears a bird flapping behind him, he hops and zaps the bird, then a fruit falls on his spaceship and he zaps the spaceship, knowing that there isn't a way to go home he looks at the camera in sadness and zaps himself.