Yosemite Sam is the captain and only occupant of a sailing ship, H.M.S. Friz Freleng with home port in Kansas City (an on-screen reference to the late animator and his hometown), and he is heading on a voyage for buried treasure with the means to get it for himself. He reaches the island, immediately finding the dig site, and uncovers both a treasure chest and Bugs Bunny on it.
Before Sam can deal with Bugs, the rabbit shoves the chest and Sam onto the ship and sets the ship in motion. Bugs avoids walking the plank and tricks Sam into thinking he is a charming mermaid, which gets him into a swimming chase with a shark. In the end, Bugs Bunny opens his treasure chest, which is revealed to be full of carrots.
Production notes
From Hare to Eternity is a parody of H.M.S. Pinafore with Yosemite Sam and Bugs Bunny performing several songs. It was issued as a tribute to Friz Freleng, who had died two years earlier. It is the final Chuck Jones-directed Looney Tunes short, before his retirement that same year.