To the planet comes a one-man spacecraft bearing the self-professed pirate Alonzo P. Tucker. He and his mechanical parrot capture Will and Dr. Smith. He releases Smith over Will (thanks to Smith's self-serving negotiating skills) then bargains with the Robinsons: Will's safe return in exchange for repairs to his ship. Will, however, is really in no danger and has, in fact, bonded with Tucker over Tucker's tall tales of adventure. Nevertheless, John accepts the terms, Will is returned, and Tucker's ship is examined. To John and Don's astonishment, it's a hyperspace vehicle that could shuttle them all back to Earth. The future looks rosy indeed for both the Robinson party and for Earth's space program except for one thing - Tucker has failed to mention he's on the run from a boulder-sized alien blob who's none too pleased with his past plundering behavior, putting them all in apparent danger.
—statmanjeff