<Li> Hawk (Thom Christopher), an alien character who represents the last of the nearly extinct bird people . </Li> <Li> Dr. Goodfellow (Wilfrid Hyde - White), an elderly scientist with insatiable curiosity . </Li> <Li> Crichton (voiced by Jeff David), a snobbish robot built by Goodfellow, but who finds it difficult to believe that lowly humans could have built him . </Li> <P> The character of Wilma Deering was softened in the second season as the producers attempted to tone down the militaristic "Colonel Deering" image, who often gave Buck orders and to make her more feminine . Another change in the second season was the sound of Twiki's voice . Mel Blanc left the series after the end of the first season and another actor, Bob Elyea, supplied Twiki's voice . Blanc returned for the final six episodes of the second season, though no explanation was given for the change in Twiki's voice . </P>

What was the robot's name in buck rogers