,Rigidbody falling through objects

My Player (which is a ball) goes through the enemy when I collide with him then starts falling through the plain? I got a Rigidbody and Sphere collider attached to him. The Rigidbody does not have a tick in the box.
Any ideas please? It seems to be my Baddie script that seems to be the reason my player goes through the enemy. I took it off it collides but I also want it to respawn to the start of the level. The script does not have a tick init nither. Do you know any baddie scripts that will work for a ball colliding in to an enemy. thanks

Does the enemy have a box collider attached to it? If not, try putting one on it.