Bill's Birthday; Rocks in Space

It's Bill's birthday and he has lots of great things planned for the day. This is going to be his best ever birthday! / Bill and Corky are shocked when they discover that a big rock is heading for Tamo's planet. They've got to warn Tamo and they've got to stop the rock. But how do you stop a big space rock? Bill and Corky don't know, but they'll have to come up with an idea very quickly!