Go to the room where you rescued the alligators. Get on to the conveyor belt at the other end and you`ll see a high voltage orb. Swing over to the ledge and go into the vent. When you get to the end of the vent wait until a cart comes by and get on it. Then just go through the obstacles until you reach the end of a vent. Go through it to another boss round. You`ll see four wheels overhead. Go around hitting them once until a goo spills. The guy then goes to clean it. This is your chance to get him! Repeat this until he`s dead.