After the spectacular defeat of a fresh centurion, Caesar sends the patrician Lucullus to capture Weda Pappa and throw him off the edge of the world. In Gaul, Malu Pappa lacks fresh fish (as always), which starts a fight, spilling Weda Pappa's magic potion. Because fresh fish is a vital ingredient thereof, Soora Pappa and Gim Pappa go fishing while Weda Pappa gathers herbs, accompanied by Chuti Kuku. In the forest, Weda Pappa and Chuti Kuku are captured by Lucullus. Aboard a Roman galley bound for the "world's edge", they pass Soora Pappa and Gim Pappa, who pursue them, using Gim Pappa as an outboard motor until he is diverted by the aroma of food from a passing pirate ship, and then blown off course by a violent storm. After a long pursuit, a dolphin brings Chuti Kuku (whom Lucullus had dropped overboard) and guides them to the Romans. Seeing the Gauls and mistaking the North American coast for the world's edge, the Romans launch Weda Pappa from a catapult, then return to Rome, while Soora Pappa sinhala cartoon and Gim Pappa make landfall. In Gaul, Caesar lays siege to their village and waits for the last of the magic potion to run out.
Soora Pappa and Gim Pappa explore the new land looking for Weda Pappa, and live off the indigenous turkeys. Soora Pappa is captured while Gim Pappa hunts for breakfast, but instead catches an Native American whom he mistakes for a disguised Roman. When he finds Soora Pappa gone and his helmet lying on the ground, he has Chuti Kuku follow the scent. On the way he saves a Native American chief's daughter from a stampede of bison. In the Native American village, Soora Pappa is tied with Weda Pappa to a pole, menaced by the natives. Gim Pappa and the girl arrive to save them, and the chief frees them; thus enraging the medicine man, who is insulted again when Weda Pappa proves himself the superior magician. That night, the medicine man pretends to offer peace, but uses the peace pipe to drug the visitors.
In the morning Gim Pappa is suffering hallucinations of the drugs and Weda Pappa has been taken prisoner by the medicine man, who demands the recipe of the magic potion. When he refuses, the medicine man releases a grizzly bear against him, but Soora Pappa — guided to the cave by Chuti Kuku — arrives to defeat the bear and its keeper. Minihooha, the chief's daughter, cures Gim Pappa with a huge meal. The natives give them a canoe which Gim Pappa paddles tirelessly across the ocean. At their village, Keko Pappa reveals that Caesar has captured the villagers, whereupon Soora Pappa and Gim Pappa — disguised as legionaries — take gourds of fresh potion to their friends imprisoned at the nearby camp of Compendium. Thus enabled, the Gauls free themselves, destroy the camp, and return victorious to their village. During the battle, Caesar escapes disguised as a wine barrel, while Lucullus is consumed alive by Caesar's pet panther.
