glitch and causes Robobum to travel to the correct era. The group is forced to abandon Robobum when a tyrannosore-arse rex attacks, leaving Robobum to fight it. After a near miss with a tricerabutt, the group is saved by a bum, who agrees to take them to the Crack of Doom to stop the Great White Bum. At night, the bum recalls her former owner, a child who took good care of her and then abandoned her for no reason. The group is kidnapped by giant stinkants and taken into their nest, where Zack and Eleanor find the freshly-written and incomplete warning. Zack's grandmother, the Pincher, reveals herself along with the Flicker and the Forker, who were responsible for the message. Robobum saves the group from a giant stinkant attack and teleports the group inside, but leaves behind the three aging bum-fighters, who have to stay behind and complete the message. Zack's bum and the tour guide bum fight over who was responsible for keeping the group safe, with Eleanor breaking up the fight and revealing that the tour guide bum is her bum. Eleanor explains that she got rid of her bum after the Great White Bum killed her mother, in order to become a bum-fighter and get her revenge. Her bum angrily leaves the craft, despite Eleanor's pleas to stay. Robobum detects a molecular signature exactly that of the Great White Bum at a nearby location and determines that the Crack of Doom is at this point. The group tries to depart, but realizes that they are stuck in bumantula webs. While Eleanor and Ned try to cut Robobum out of the web, Zack and his bum rescue a creature stuck in the web. They discover that the creature is the kisser, who was consumed by mutant zombie maggots in the previous book and regurgitated in the past when they became blowflies, leaving him in his liquid form. Zack believes his claim that he is on their side and rescues him. The group retreat into the craft as a bumantula latches onto it, almost crushing Robobum and killing her occupants as she attempts to fly away. She is rescued by the Great White Bum, who believes that she is a real bum, and falls in love with him. Realizing their opportunity, the group plots to stop Bumageddon by accepting the Great White Bum's marriage proposal and paralyzing him