a) Looking to cure Marty's athlete's foot, Doc and Marty travel back in time to locate an extinct frog in South America, where they have to stop Biffando from stealing the Incas' gold.
b) Two bank robbers steal the DeLorean and end up outside an Australian prison in 1790. With him having been in the back seat, it's up to Einstein to get himself and these robbers home.
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