Rob was the big brother of Bob, they were human. They got into a sibling argument. Bob ran away and Rob followed him. Bob jumps into a black goo. Rob wanted to save him, but theres scientist pulled and puts him into a tub. He got mixed with the black goo that Bob jumped in. They put a special material. Once Rob woke up. He has hatred feelings against Bob. He broke out from the lab. Rob still helps the lost souls that has been defeated by The Eternal Bob. They'll reborn with Rob and seal Bob.