Poseidon, tired of being forgotten, holds a boating race in his honor, with Adonis competing for Thrace against Hercules and Icarus. However, when their star rower Hylas (Rocky Carroll) is injured, the King of Thrace hires Hercules instead, who abandons Icarus. Fortunately, Amphitrite (Leslie Mann), wife of Poseidon, has taken a special interest in Icarus, and helps he and his father Daedalus complete their boat. At a regala held the night before the race, Hercules declares himself bigger than Poseidon, which causes the sea god to unleash Charybdis, a giant maelstrom sea creature, during the race, which causes both his and Icarus' ships to nearly sink. Rescuing first his friend and then Adonis, Hercules looks on as Icarus wins the Poseidon Cup, being the only one to have truly earned it.
- The phrase "bigger than Poseidon" is a reference to John Lennon's controversial remark, where he insisted that the Beatles were more popular than Jesus.