Another spaceship sends out an SOS because their leader, a computer, needs brain surgery. Smith offers to operate for a fee, then fails, prompting the Robot to take over. Meanwhile Dr. Smith accidentally turns into a nine-year-old boy after tinkering with a clock.
Hardie gets assigned to protect a diamond salesman carrying a small fortune in gems.
Scott and Robinson are ordered to break up an anti-American group that's threatening the Japanese government.
