User blog comment:MorganaEmrys/Spin-off, What do you want?/@comment-5674726-20130104195612

I don't think that there's enough scope for a storyline in the missing years, and they would also leave the showrunners very limited in terms of the length of a spin-off's run - for example, if the series takes place between Seasons Four and Five, they're limited to three seasons, and given that it was apparently a time of peace and plenty, they'd probably be fairly dull seasons.

I'd like to see a prequel series, either charting Uther's rise to power or, alternatively, showing Camelot roughly a decade prior to Merlin's arrival. Uther (old enough to be played by Anthony Head) as King, with the problems he had - we know that Camelot and Mercia were at war. Little Arthur and Morgana. Adventures that the knights of Camelot had before Arthur was old enough to lead them. They could have a fair bit to explore.