After picking up J5 (an annoying Lou Wagner) a pointy-eared alien lad, the Jupiter2 is drawn a celestial light-ship whose sole crew-member is an incompetent and eccentric 'colonel' (Woodrow Parfrey) that is drifting towards destruction. This is one of the weaker episodes of the series. The plot makes little sense and the failure of the script to get even the most basic of astronomical terms correct borders on self-parody. The 'Lost in Space' universe has long since stopped making sense (when the series opened, the Robinsons were early explorers to the nearest star, but by season 3, there seems to be human constructs scattered throughout deep-space, alien civilisations are sufficiently familiar that the Robinsons are never surprised to meet an extraterrestrial, and the Jupitar 2 seems to be able to wander through cubic parsecs of space despite never seeming to have any fuel). The episode has some similarities to Star Trek's far superior 'Charlie X' and supposedly J5 is sporting authentic Vulcan ears (presumably borrowed from the show's space-opera rival). The premise that J5 has some kind of invisible shape-shifting familiar and/or psychic powers goes nowhere and the shows reliance on repurposing random props (like the space-station's Victorian dining room) is getting ridiculous. I watched the episode recently on MeTV and don't recall seeing a scene in which Dr. Smith 'examines' J5 (but I suspect that a few minutes of every episode has been excised to make more room for commercials).