Episode Detail: Dick's Big Giant Headache - 3rd Rock From the Sun
William Shatner is immensely funny as the Big Giant Head, the Solomons' supreme leader, who visits Earth for the first time. The boss is arriving to reevaluate their mission throwing Dick and his group into a panic. Vicki: Jan Hooks. Alissa: Larisa Oleynik. Officer Don: Wayne Knight. Sally: Kristen Johnston.