Fireball XL5 was a 1962 UK children's sci-fi television serial produced for ITC Entertainment in Slough, Buckinghamshire by Gerry & Sylvia Anderson through their company APF (in association with ATV).
The serial featured Andersons' Supermarionation marionettes, which is a form of puppetry first introduced in Four Feather Falls (1960), and used again in their subsequent series such as Supercar (1961-1962), Stingray (1964-1965), Thunderbirds (1965-1966), Captain Scarlet (1967-1968), Joe 90 (1968-1969) and The Secret Service (1969). Special effects in the Fireball XL5 episodes were made by Derek Meddings, music by Barry Gray.
Thirty-nine black & white half-hour episodes of Fireball XL5 were made on 35mm celluloid; all other Anderson series would be produced in colour.
A similar program (often confused with Fireball XL5) is Space Patrol (also known as Planet Patrol in the USA) due to a number of settings & similarities.
The Fireball XL5 show was a major success for the Andersons, being the first of their marionette shows to be sold to a USA Television network (NBC), which was pretty rare for British programmes at the time.
What's it worth? Take a look at this Fireball Xl5 price guide: sold listings for a value indication.