Sub-Smash

"Sub-Smash" is the eighth episode aired of the first series of UFO – a 1970 British television science fiction series about an alien invasion of Earth. The screenplay was written Alan Fennell and the director was David Lane. The episode was filmed between 18 and 28 November 1969 and aired on the ATV Midlands on 11 November 1970. Though shown as the seventh episode, it was actually the seventeenth to have been filmed.

The series was created by Gerry Anderson and Sylvia Anderson with Reg Hill, and produced by the Andersons and Lew Grade's Century 21 Productions for Grade's ITC Entertainment company.