Triceratops. Eventually, the Allosaurus makes its way to the campsite and attacks the exploration party. It is finally driven off by Ed who tosses a torch into its mouth. Convinced that the camp is not safe, Ed climbs a tree to look for a new location, but is attacked by the apeman. Roxton succeeds in shooting the apeman, but the creature is merely wounded and escapes before he can finish him off. Meanwhile, an Agathaumas is attacked by the Allosaurus, and gores it to death. Suddenly, a Tyrannosaurus attacks and kills the Agathaumas, along with an unfortunate Pteranodon. The explorers then make preparations to live on the plateau potentially indefinitely. Challenger designs a catapult to defend the camp. During a search for Maple White, Roxton finds his remains, confirming his death. It is at this time that Ed confesses his love for Paula and the two are unofficially wed by Summerlee who used to be a minister. Shortly afterwards, as the paleontologists are observing the Brontosaurus, an Allosaurus attacks it and the Brontosaurus falls off the edge of the plateau, becoming trapped in a mud bank at the base of the plateau. Soon afterwards, a volcano erupts causing a mass stampede among the giant creatures of the lost world. The crew is saved when Paula's pet monkey Jocko climbs up the plateau carrying a rope. The crew use the rope to pull up a rope ladder constructed by Zambo and Austin and then climb down. As Ed makes his descent, he is again attacked by the apeman who pulls the rope ladder. The apeman is again shot and finally killed by Roxton. They discover the Brontosaurus that had been pushed off the plateau had landed softly in the mud of the river, trapped but still alive, and Challenger manages to bring it back to London, as he wants to put it on display as proof of his story. However, while being unloaded from the ship, the spooked and disoriented animal escapes and causes havoc until it reaches Tower Bridge, where its massive weight causes a collapse, and it swims down the River Thames. Challenger is morose as the creature leaves. Ed discovers that the love he left in London has married in his absence, allowing him and Paula to be together. Roxton morosely but gallantly hides his love for Paula as Paula and Ed leave together, while two passersby note: