The plot features Ronald and the gang out on a journey to Grimace Island where Grimace's species is discovered. Grimace previously received a letter which was actually written by the pirate captain One-Eyed Sally and her first mate Blather. The two pirates follow them to capture the treasure on the island.

The plot follows series regulars Grandpa Boris and the babies as they become trapped in the attic on Passover; to pass the time, Boris tells the Jewish story of the Exodus. During the episode the babies themselves reenact the story, with young Tommy portraying Moses, while his cousin Angelica represents the Pharaoh of Egypt.