Possible Clues:

• "Dune," for one
• "Battlestar Galactica," for one
• Sci-fi subgenre
• Genre for 'Dune' and 'Flash Gordon'
• 'Dune' or 'The All-Consuming World'
• Intergalactic sci-fi subgenre
• 'Flash Gordon' genre
• 'Battlestar Galactica,' for example