Which Anderson show had the most episodes? It may come as a surprise to most Anderson fans, but both the early puppet production THE ADVENTURES OF TWIZZLE and the live-action spy series THE PROTECTORS, with 52, have the most episodes of any series in the Anderson canon. TWIZZLE's episodes were only 15 minutes each, unlike the later half-hour puppet productions, and most have been lost to collectors due to poor preservation of the image media. THE PROTECTORS, a 1972-74 half-hour action-adventure series that many casual Anderson fans have no idea even belongs in the canon, lasted two seasons and production was set to begin on a third when co-financiers Faberge withdrew their support. THE PROTECTORS is considered the "black sheep" of the Anderson family due to its lack of success in the U.S. and its complete lack of connectivity with any of the other Anderson series, though series co-star Tony Anholt went on to play Tony Verdeschi in the second season of SPACE:1999.

The Anderson series with the most episode time is SPACE:1999, whose 48 episodes in uncut and uncommercialed form total 40 hours.