There's something to be said for finishing what you've started. That's why the gentile Captain Long John Silver is heading back to Treasure Island to see if he can unearth the cache of riches buried there by his colleague, Captain Flint. At the same time, he also hopes to bring to safety the governor's daughter and a young boy abducted by El Toro.

A young woman discovers she is the daughter of the infamous Dr. Jekyll, and begins to believe that she may also have a split personality, one of whom is a ruthless killer.

A rich but unscrupulous old woman plots with a scientist to have her brain implanted in the skull of a sexy young woman.

A scientific experiment involving subjecting a corpse to an extreme charge of electricity accidentally revives an executed criminal and makes him impervious to harm, allowing him to seek revenge on his former partners, and deal similarly with anyone else who gets in his way.