In the final season of “Lost in Space,” the Robinson family successfully reaches their destination, Alpha Centauri, but not without significant challenges; the ending sees Will and the Robot venturing out to explore the galaxy together, signifying a new chapter for them, while the rest of the family settles into their new life on the planet, with a hopeful and somewhat bittersweet tone, implying that their journey is not truly over.
There is an episode in the final season where they were fooled into believing they had landed on one of the planets of AC by a bunch of aliens disguised as young 60's earth hippies. That episode was called, "The Promised Planet."