The Big-O-Blaster (better known as B.O.B.) is a doomsday weapon built by Mingella and Blobbelda in Banjo-Tooie. The machine can suck the life force out of anything shot by its energy beam, reducing objects to a monochrome state and zombifying living creatures (and in the case of smaller life forms, reducing them to ash). This process also works in reverse, providing there is enough life force stored for the target. In addition, it was also capable of having a reach as far as the entire Isle of Hags if necessary, as Gruntilda initially considered using it on the entire island after stealing King Jingaling's life force with it, with Mingella and Blobbelda confirming such was possible. However, they also admitted that it would require several hours to charge up enough energy just to begin to target the island.
Mingella and Blobbelda intended to restore their skeletal sister Gruntilda to full life after she was defeated by Banjo and Kazooie and trapped under a boulder for two years. Once rescued, Grunty used B.O.B. to suck the life force from King Jingaling and his palace; however, since Gruntilda's body was somewhat less than slim, Jingaling's life force alone wasn't quite enough. She decided to blast the entire Isle o' Hags, which was possible, but only after a charge-up that took so long that Banjo and Kazooie reached Cauldron Keep before it could fire. Once the pair beat back Grunty and her sisters, Kazooie restored the life force to Jingaling's palace and also Bottles, who was killed much earlier. Where the "extra" life force that saved Bottles came from is unknown, though it's possible that the amount that had been charged by the time Banjo and Kazooie reached the machine was enough to revive Bottles.
- The B.O.B.'s overall design resembled that of the Blast-O-Matic from Donkey Kong 64. The primary difference is that B.O.B. was designed simply to suck (and blow) life force onto various groups, while Blast-O-Matic was specifically designed to obliterate locations such as Kong Island. As both Banjo Tooie and Donkey Kong 64 were developed by Rare, it's likely that the similarities were intentional.