B.O.B., short for Benzoate Ostylezene Bicarbonate, is a blue one-eyed indestructible gelatinous mass that was spontaneously created in a laboratory when scientists injected a chemically-altered ranch dressing into a genetically-altered tomato. He has the ability to absorb anything, can form into any shape, doesn't have a brain and digests objects within seconds (depending on size). He can also extend his body and detach his eyeball. He was captured in 1958 and was sent to Area 52. It is unknown how far B.O.B. can actually elongate his whole structure, but is seen to be very long in the movie after helping himself and the other monsters get to the brain/heart of Aliens Spaceship when Aliens were charging at them. He is the joker of the team always laughing and being dimwitted at times. In the movie he was the only one to think of a 'successful plan' than the other monsters to get to Ginormica (Susan Murphy) without being seen, what a great plan that is for someone who doesn't have a brain! Since he doesn't have a brain, he sometimes mistakes his team as the foe during the battle with the aliens, and he also might go the wrong way or get distracted by something. It is almost approved that he resistant to physical attacks because he defended Dr. Cockroach from Alien that was attacking him but managed to stay stable after being punched in the eye and the eye bounced back then forward hitting the Alien. It could be possible that he is resistant to energy and mental attacks because of his unique physique but that is not approved.