were the first APF productions to be credited as being "Filmed in Supermarionation". The music for the series was composed and conducted by Barry Gray. The opening and closing theme song vocalist for the first series was Mike Sammes; for the second series, Sammes' vocal group The Mike Sammes Singers re-recorded the theme. The complete series is available on DVD in the United Kingdom, Australia, and North America, where it has been issued twice. The series was released on Blu-ray in the 60th Anniversary year on 20 September 2021. Cast and characters Cast of characters Recurring heroes Mike Mercury: test pilot of Supercar; voiced by Graydon Gould Professor Rudolph Popkiss: co-inventor of Supercar; voiced by George Murcell in series 1 and Cyril Shaps in series 2 Doctor Horatio Beaker: co-inventor of Supercar; voiced by David Graham. Jimmy Gibson: kid brother of Mike's pilot friend Bill Gibson, saved by Mike in episode 1; voiced by Sylvia Anderson, credited as Sylvia Thamm in series 1 Mitch: Jimmy's pet monkey; voiced by David Graham. Recurring villains Masterspy: a foreign spy, obsessed with stealing Supercar; voiced by George Murcell in series 1 and Cyril Shaps in series 2 Zarrin: Masterspy's henchman; voiced by David Graham. Mr. Harper: a posh English criminal; voiced by George Murcell. Ben Judd: a lower-class Cockney criminal; voiced by David Graham. Other recurring characters Bill Gibson: Jimmy's elder brother, Mike Mercury's pilot friend who owns a shipping business; voiced by David Graham Felicity Beaker: Doctor Beaker's cousin, who owns an estate in Africa; voiced by Sylvia Anderson Casting the characters The cast for Supercar was put together weeks before shooting was to commence. The lines were recorded in the rushes theatre, which was transformed into a recording studio. Lines were recorded on a Sunday (once every month), because the studio was on a trading estate, meaning Sundays were the quietest days of the week. The recording sessions typically took place between 9:30 a.m. and 5:30 p.m., during which time the cast, along with the sound engineers, would try to get through at least three scripts. Canadian actor Graydon Gould (The Forest Rangers), who voiced Mike Mercury despite never auditioning for the part, was offered it whilst doing a stage production that was shown on television. In an interview Gould recalls that, without owning a car, getting to Slough was difficult because "Sunday transport is about half of what it normally