played by John Levene
Irregular as a regular, he appeared as part of UNIT for Patrick Troughton, Jon Pertwee, and Tom Baker.
Benton was a member of UNIT from when it fought against the Cyberman invasion to when they defeated the Kraals. He travelled in the TARDIS once in The Three Doctors. He was also a love interest for Jo Grant. Benton started as Lance Corporal and was promoted to Sergeant for Spearhead from Space. Promotion to Warrant Officer was mentioned in The Three Doctors. He was promoted to Regimental Sergeant Major for Robot.