| OMNIVERSE | Set of all parallel realities, in science fiction |
| ALEPHZERO | Name for the cardinality of the set of all natural numbers (5-4) |
| RANGE | A rank or row; a cooking stove; or, in maths, the set of all possible values the function can produce (5) |
| LOCUS | The given set of all points |
| ALPHABET | Set of all letters |
| SUBSPACE | In science fiction, a hypothetical method of communication which is faster than the speed of light (8) |
| SUNS | Some planets have several of these, in science fiction novels |
| SCORNFUL | Contemptuous of banality in science fiction, endlessly dull |
| MARTIAN | Inhabitant of Mars, in science fiction (7) |
| UNWORLDLY | Having little awareness of the realities of life |
| STASIS | What word referring to the flow of bodily fluids has come to be used in science fiction to mean a ty |
| ESCAPIST | A person who seeks relief from unpleasant realities, often in the form of fantasy (8) |
| HINDSIGHT | Recognition of the realities, possibilities or requirements of a situation after its occurrence (9) |
| BRASSTACKS | Term, in allusion to brazen nails holding things together, for basic realities, hard facts of business, nitty-gritty, nuts and bolts and the like (5,5) |
| TOR | Big publisher in science fiction |
| MUTATED | Changed form, in science fiction |
| ISAAC | First name in science fiction |
| PLANET | Krypton, in science fiction |
| VERNE | Seminal name in science fiction |
| EARTHLING | One being in science fiction (9) |
