AllMovie

The Robinsons come across an odd-looking laserlike device, indicating that someone else will soon be visiting their planet. Shortly thereafter, a family of aliens--specifically, Taurons--show up, baffling the Robinsons with their strange "electronic" language. Though both the Robinsons and the Taurons are wary of each other, they both make an effort to extend the hand of friendship--an effort destroyed by the interference of (who else?) Dr. Smith (Jonathan Harris). Fortunately, Will Robinson (Bill Mumy) has managed to bond with his Tauron counterpart (Eddie Rosson), a fact that turns out to be a life-saver in the climactic scene.