S1, E13: Martin (Ray Walston) decides to combine business with pleasure by agreeing to go on a picnic with Tim (Bill Bixby) and their pretty neighbor Jennifer Richmond (Kathy Kersh)--not to mention the girl's pesky kid brother Stevie (played by a pre-"Eddie Munster" Butch Patrick). Figuring that Tim will be kept busy with Jennifer, Martin will have plenty of time to hunt for "glink", an element necessary to reactivate his spaceship. But when Stevie manages to get stuck on the top of Thunder Mountain, Martin is saddled with the responsibility of helping Tim (who is deathly afraid of heights) become a hero by rescuing the boy.