Monsters vs. Aliens Wiki
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General information



Mutant Tomato

Home World



Absorbent at Will
Form Any Shape
Mind Reading (formerly)
Speak Zombie and Pumpkin
Predict the future (formerly)


Area Fifty-Something Monster Agent




Unnamed (sister; allegedly)
B.O.B.'s mother (mother)

Behind the scenes
Voiced by

Seth Rogen
Dave B. Mitchell (Madagascar Kartz)
Eric Edelstein


Titular Character of

The Blob

Television series

Monsters vs Aliens

Feature film

Monsters vs. Aliens

Short film

B.O.B.'s Big Break


Mutant Pumpkins from Outer Space
Night of the Living Carrots

Video game

Monsters vs. Aliens


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 Fifty-Something.


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 core of the spaceship when the Clones 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 without being seen. It is almost proved that he's resistant to physical attacks because he defended Dr. Cockroach from the 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 and lack of a brain but that is not proven.

  • B.O.B. is the result of an experiment involving a genetically-altered tomato injected with chemically-altered ranch dressing, the combonation mutated creating B.O.B., and also endowed B.O.B. with a wide array of useful powers, including but not limited to:
    • B.O.B. can greatly increase the quantity of his slime, expanding enough to fill a large swimming pool (Maximum B.O.B.) and grow dozens of arms and extend them to great lengths (It Came...on a Field Trip).
    • He can absorb an extremely-powerful explosion strong enough to destroy Area Fifty-Something and a vast portion of the surrounding desert by containing it within his body (This Ball Must Be Dodged).
    • He can survive without oxygen and is immune to the vacuum of space (You Can't Breathe in a Diner in Space!).
    • B.O.B.'s slime body is refractive, he once passed through a laser field and he caused the laser beams to randomly scatter about (98 Pound Cockroach) and Sqweep once tried to use a mind-ray and it just sprayed around randomly (Night of the Living Dog).
    • According to Link, B.O.B.'s body temperature is toasty warm (Maximum B.O.B.).
    • In his semi-solid state, B.O.B.'s body has the consistency of rubber, when one of Gallaxhar's clones punched B.O.B. his eye just rebounded and knocked the alien out (Monsters vs. Aliens).
  • One unique result of B.O.B.'s creation is that he does not have a brain and this makes him immune to a number of mind-affecting techniques, such as:
  • B.O.B.'s semi-unintelligent behavior can be useful in situations when fighting rigidly structured opponents and can allow him to think outside of the box when creating plans, such as:
  • B.O.B. has gained several temporary powers throughout the series as a result of absorbing or digesting certain objects or substances:


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. This can be proven since he doesn't know simple problems in Educational Television.

Due to his state of matter, anything can go though him. If the object is small, he may not notice it.

In The Sneezing Horror, when B.O.B. is sick, he hallucinates and develops different personalities in which he can't control.

According to Meet the Monsters, his condition also makes it impossible for him to swim.


B.O.B. is the end result of a experiment combining a genetically engineered tomato with chemically altered ranch salad dressing. He subsequently went on a rampage devouring six city blocks before he was captured by General Monger in 1958 and imprisoned inside Area Fifty-Something. Once at the base Monger force fed him a excessive amount of Carrot puree that deeply traumatized him.

He met The Missing Link 3 years later in 1961, Dr. Cockroach another year later in 1962, The Invisible Man sometime before 1968 and Insectosaurus one year later in 1969. Prior to the episode Attack of the Movie Night, B.O.B. was frightened by big moustaches, and to cure him, Link had to put on a fake walrus moustache and B.O.B. attacked him.

B.O.B.'s Big Break

In 1968 Doctor Cockroach and Missing Link threw B.O.B. a birthday party, which in reality was a false premise they used to feed B.O.B. a chemical compound they believed would turn him into a living bomb in a effort to escape the base. Instead of having the desired effect however the bomb compound gave B.O.B. the ability to read minds. Deciding to make the most of it Link and Doctor Cockroach attempted to use B.O.B. to read Monger's mind a find a way to escape the base.

The group succeeded in finding Monger's personal jet, unfortunately B.O.B. was led to believe the jet was a pinata and thus destroyed the jet leading to the trio's recapture by Monger. Worst yet the group soon learned that B.O.B.'s mind reading powers had been destroyed in the crash which led to another birthday party for B.O.B., of which only Monger, B.O.B. and the Invisible man enjoyed.

Unfortunately 16 years after the party in 1964 the Invisible Man died of a Heart attack, the others didn't let B.O.B. know so that they could avoid hurting his feelings instead telling him that the invisible Man escaped.

Monsters vs. Aliens

No sooner is Susan placed in the monster prison and meets her cellmates, she's frightened beyond her wits' end. Immediately, B.O.B. wishes to know her name, and she replies 'Susan'. Just 3 weeks after Susan arrived, Gallaxhar had arrived with an arsenal that overwhelmed the US army's own. After Dr. cockroach had failed to shrink Susan down to size once again, General Monger had arrived and offered them a deal: take down the wandering robot probe and they gain their freedom. After winning the San Francisco battle and earning their long-awaited freedom, the monsters make their 1st visit to Modesto, albeit with disastrous results. After Susan gets abducted and Insectosaurus is killed by Gallaxhar, it is Link. that comes up with the plan to board the spaceship via jetpacks. After activating the self-destruct sequence, B.O.B., Link and Dr. Cockroach are trapped in one of the ship's chambers. Failing to understand what was happening, he tells them he would see them tomorrow. The others promise him a wonderful meal. At the last moment Susan becomes Ginormica once more and she busts them, making their way to General Monger and the resurrected Butterflysaurus. After being hailed by Modesto and the world as heroes, B.O.B. 'breaks up' with Derek, choosing him over Diane before he joins the rest of team monster in the battle with Esgargantua in Paris.

In Mutant Pumpkins from Outer Space

Tried to go out as Elvis, until Monger mentions a space ship over Modesto. He then tries to negotiate with the pumpkins, as he knew the "Produce" language. After this, and an insult about his mother in a salad bar, he and the others worked with the neighborhood children to fend off the pumpkins.

In Night of the Living Carrots

When Link vanquished the last mutant pumpkin, some of it's genetic material came in contact with a carrot. It soon spread to a whole army that upon biting anyone with a brain became a zombie. Upon being told that only he could stop them, B.O.B. screamed in horror: After he was sent to area fifty-something, Monger fed him an endless amount of mushy carrots. B.O.B. considered replacing his zombified friends with plush toys, but he knew he couldn't, so he ate all of the Modesto carrot plague, freeing all those who were under the zombie influence (albeit temporarily becoming a carrot himself).

Behind the Scenes

B.O.B. is a parody of the antagonist from the 1958 film, the Blob. In said film, an alien substance goes on a rampage, absorbing anything in it's path. His origin and one eye are more akin to the film 'Attack of the Killer tomatoes'.


Dr. Cockroach As the 2nd monster captured by Area 5?, Dr. Cockroach became one of B.O.B.'s earliest friends. Dr. Cockroach is the one who explains to B.O.B. certain knowledge, like Susan's Gender.

The Missing Link Link came to Area 5? In the 60s as the 3rd monster to be captured. After Insectosaurus was excluded from the series, Link and B.O.B. became best friends.

Insectosaurus Very is little known about B.O.B.'s relationship with Insectosaurus.

Ginormica  When B.O.B. and Susan first met, he was probably the least frightening monster in her view.


  • "I will see you guys tomorrow, for lunch."
  • "Sorry, I was just staring at this bird over there."
  • "What happened to the "there isn't a jar in this world I can't open" stuff? Wait, did you really find I jar you couldn't open? What was in it? Were there pickles in it? Where is the giant jar of pickles?"
  • "Yippie dinkle doo!"


  • B.O.B./Gallery


  • In Debtor Alive!, he is revealed to not trust money and tries to pay things in B.O.B. Bucks (hand-drawn pictures of him in ties with dollar signs on the corners)
  • In I Predict Horror B.O.B has a brown eye when he is blue, but when he turns pink, his eye changes to green.
  • He is the only one of the monsters that is indestructible.
  • He somehow is very intelligent for someone with no brain.
  • He's not the best at maintaining a secret.
  • In the early stages of production, B.O.B. was called Ick!.
  • The year B.O.B. was captured is a reference to the movie that inspired the character.
  • B.O.B. became Link's best friend after Insectosaurus left the series.