He was a mechanic who owned a garage named Mason's Autos and he carried a radio on a strap over his shoulder as he enjoyed music.
One particular evening, he met Captain Black who had driven in and asked if his petrol tank needed filling. Black nodded and Mason asked him to reverse so he could use the petrol filter. Black however, deliberately reversed too fast and ran him down. The Mysterons then reconstructed him to accomplish one of their aims.
Later two con-men named Steele and Kramer arrive and Mason has been given instructions by the Mysterons to sabotage their car by draining their brake fluid which he does as the aliens have picked these two men to reconstruct as well.
He is not seen again after this.
- The music that plays from Mason's radio is "White as Snow" by Barry Gray that used in the episode White as Snow.
- The puppet for Mason was previously used for the 5th London Police Officer in Big Ben Strikes Again and the 2nd Medical Student in Operation Time, it later appears as an Airport Mechanic in Place of Angels, the Driver in Expo 2068 and Joe Johnson in Traitor.
- The puppet appears in Joe 90 as a Hotel Clerk in International Concerto, a Taxi Driver in Business Holiday and a Private in Attack Of The Tiger