Dawson Palmer

Following a tense effort to rescue John Robinson from deep space, the Jupiter 2 is drawn inside a massive alien spaceship. There, the family confronts a strange race of bubble creatures.

The Jupiter 2 lands on a planet Dr. Smith mistakenly believes is Earth. When Smith is lured out of the ship by cyborgs masquerading as earthlings, the Robot saves him - and the family - in the nick of time.

Young Will Robinson nearly runs off with an intergalactic circus, coaxed by a charismatic entertainer named Marvello who believes Will has a special talent for ESP.

Will comes up with an idea for a two-man ship that can travel to Earth. But when Dr. Smith hijacks the ship, a crash landing finds Will and Smith trapped in a jungle, pursued by a bush creature.

A female android, capable of human emotions, joins the Jupiter 2 - only to be rejected by Smith and the Robot because of her superior intelligence.

A strange galaxy tribunal imprisons the family, and attempts to try the crew members for crimes committed in outer space. The Robinsons are vindicated, while Smith is excused by reason of insanity.