Bob and Emily suffer international complications when they host a French psychologist in their home as part of a medical exchange program.
The Robinsons confront their mistrust of an alien family that has beamed in from space. Unable to understand their language, they fear for Will's safety when he and the little alien boy disappear.
Secret agents James T. West and Artemus Gordon determine to track down a missing Albanian princess when the regal young lady they have been guarding turns out to be an impostor.
