The strip revolved around the adventures of RAF space pilot (!) Jim "Jet-Ace" Logan and (in the majority of stories, though not the first few) his co-pilot "Plum-Duff" Charteris, who have outlandish adventures in a time roughly 100 years from the time they were written in. Jet-Ace himself is often depicted as a rather more comedic figure than most of his fellow space heroes of the time, though he is still very much in the same mould as Dan Dare or Captain Condor in other ways.
Michael Butterworth created Jet-Ace Logan and he scripted the very first adventure. This was drawn by Geoff Campion. All subsequent adventures that appeared in Comet were scripted by David Motton and were drawn by John Gillat. David Motton also wrote some adventures for Thriller Picture Library, namely 'Times Five', 'Seven Went To Sirius', 'Ten Days To Doom', etc.