Nogoodnik

He's just a nogoodnik.

Then at the last minute Harris was brought aboard as Dr. Zachary Smith, initially an authentic, lip-curling nogoodnik who, it was presently discovered, could be better used for laughs played off Mumy and a sober-sided robot (“You bubbleheaded booby,” sneers Harris. “That does not compute,” returns the robot dryly).

Lorne's role was that of Gary, the nogoodnik father.