Beldar and Sonja, a couple of thieves belonging to the legendary world of sword and sorcery, steal a precious stone shaped like a human heart in the gloomy crypt of the Order of the Thousand Eyes, an evil sect of powerful wizards. To flee the scene realize that the gem is cursed and sent them his spell. After losing consciousness, Beldar awakens in another world, metamorphosed into the body of a teenager of sixteen Madrid eaten by acne.
Homer is an orphan who was never adopted, becoming the favorite of orphanage director Dr. Larch. Dr. Larch imparts his full medical knowledge on Homer, who becomes a skilled, albeit unlicensed, physician.
Dashing legionnaire Rick O'Connell and Beni, his weasel of a companion, stumble upon the hidden ruins of Hamunaptra while in the midst of a battle in 1923, 3,000 years after Imhotep has suffered a fate worse than death; his body will remain undead for all eternity as a punishment for a forbidden love.