Lost in Space (1965)

S3E3 Kidnapped in Space

Dr. Smith responds to a frantic call from an alien spacecraft. He makes his way there in the Space Pod and learns that the aliens need him to perform a crucial operation on their leader, who actually functions as a central control mechanism for their robotic species. The survival of the aliens hinges on the leader's functionality. Just in time, the Robinsons arrive aboard the Jupiter II to help Smith. After successfully repairing the leader, the Robinson family departs the alien ship, leaving the aliens in good hands.