Chris Warfield

After a billion billion years the strange forces of cosmic energy have put together nameless nuclei that met and fell to Earth.

Lucy and Viv decide they need an extra room where they can entertain visitors.

Robbie (Don Grady) tries to get a date with a classmate (Perri Sinclair), who does not seem to be interested. Robbie tries the approach his teacher, Mr. Wiley, uses in history class to get the students interested in what he is saying.

When Timmy and Don accidentally release the guinea pig from an experimental rocket, they replace it with Timmy's guinea pig Alexander the Great.

Corey and Lassie stop to help young Johnny Conrad on their way to supervise the cutting of the national Christmas tree.

Timmy befriends a tomboy girl whose father, a professional rodeo rider, is reluctant to compete again after a bad accident in the past.