Thanks for the Honeymoon

S5, E15: Patty Duke and Carol Lawrence are the guest stars as McGarrett goes after the untouchable king-pin of narcotics traffic in the islands. Toni (Patty Duke), an underworld fringe character, agrees to turn state's evidence against the mobster on one condition -- that McGarrett must release her from prison and arrange her wedding to the father of her unborn child.