Alonzo P. Tucker is a human from Earth who was born in Punxatawney, Pennsylvania in 1858. In 1876 he was abducted by Tellurians, an alien civilization which roams the universe abducting members of different civilizations for study. After escaping from the Tellurians he adopted the persona of a pirate and undertook a criminal career. Tucker is very boastful, but most people would take his tales with a grain of salt. Will Robinson, however, is captivated by Tucker's tall tales. In a touching scene at the end of the episode "The Sky Pirate," Tucker confesses to Will that back on Earth he was nothing but the town nuisance.