Adventures printed separately for the game included two more adventures set on Volturnus (SF-1: "Volturnus, Planet of Mystery" and SF-2: "Starspawn of Volturnus" continuing the adventure included in the basic set), SF-3: "Sundown on Starmist", SF-4: "Mission to Alcazzar", SF-5: "Bugs in the System" and SF-6: "Dark Side of the Moon". The last two modules (SF-5 and SF-6) were written by authors from TSR's UK division, and are distinctly different from the others in the series in tone and production style.