Diff'rent Strokes

The Hitchhikers (2) (a.k.a.) Hitchhiking (2) (6x15)

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Hitchhiking leads to kidnapping for Arnold and Kimberly, but Arnold escapes and he is so disoriented he is unable to remember the location of the kidnapper's apartment so that the police can rescue Kimberly who's still being held captive ... and this time, her captor (who, as will be revealed later) has done this before and is determined this time to succeed.