Renowned adventurer Allan Quatermain (Connery) leads a team of extraordinary figures with legendary powers to battle the technological terror of a madman known as "The Fantom." This "League" comprises seafarer/inventor Captain Nemo (Shah), vampiress Mina Harker (Wilson), an invisible man named Rodney Skinner (Curran), American secret service agent Tom Sawyer (West), the ageless and invincible Dorian Gray (Townsend), and the dangerous split personality of Dr. Jekyll/Mr. Hyde (Flemyng).