The Lost Saucer Opening Sid And Marty Krofft - Starring Jim Nabors and Ruth Buzzi

El Wiki quote:
The Lost Saucer was about two time-travelling futuristic androids named Fi (Ruth Buzzi) and Fum (Jim Nabors) who land their flying saucer on present day Earth. They inexplicably invite a young boy named Jerry (Jarrod Johnson) and his babysitter Alice (Alice Playten) to check out the interior of their craft.

~Joe