| Sci-fi or suspense, e.g. | 24 |
| Sci-fi or western | 17 |
| Sci-fi passage | 14 |
| Sci-fi people | 13 |
| Sci-fi phenomenon | 17 |
| Sci-fi phenomenon that could change history | 43 |
| Sci-fi physician played by DeForest Kelley | 42 |
| Sci-fi pic starring Tommy Lee Jones and Will Smith, for short | 61 |
| Sci-fi pilot Solo | 17 |
| Sci-fi pioneer | 14 |
| Sci-fi pioneer Jules | 20 |
| Sci-fi pioneer Verne | 20 |
| Sci-fi planet inhabitants | 25 |
| Sci-fi play from 1921 | 21 |
| Sci-fi play of 1921 | 19 |
| Sci-fi play of 1923 | 19 |
| Sci-fi play that introduced "robot" | 45 |
| Sci-fi play written in Czech | 28 |
| Sci-fi portal | 13 |
| Sci-fi power | 12 |
| Sci-fi prefix | 13 |
| Sci-fi preservation technique | 29 |
| Sci-fi primates | 15 |
| Sci-fi princess | 15 |
| Sci-fi princess with a "cinnamon bun" hairdo | 54 |
| Sci-fi psychic | 14 |
| Sci-fi race | 11 |
| Sci-fi race with a gray-colored heart | 37 |
| Sci-fi regular | 14 |
| Sci-fi regulars | 15 |
| Sci-fi remake? | 14 |
| Sci-fi remakes? | 15 |
| Sci-fi robot | 12 |
| Sci-fi role | 11 |
| Sci-fi role for Buster Crabbe | 29 |
| Sci-fi role for Natalie Portman | 31 |
| Sci-fi role starting in 1966 | 28 |
| Sci-fi royal | 12 |
| Sci-fi sage | 11 |
| Sci-fi saucer | 13 |
| Sci-fi saucers | 14 |
| Sci-fi saucers: Abbr. | 21 |
| Sci-fi scenario | 15 |
| Sci-fi serial hero | 18 |
| Sci-fi series about people with special powers | 46 |
| Sci-fi series featuring Will Robinson | 37 |
| Sci-fi series set in the 23rd century | 37 |
| Sci-fi series written by William Shatner | 40 |
| Sci-fi servant | 14 |
| Sci-fi servant, sometimes | 25 |
| Sci-fi setting | 14 |
| Sci-fi setting, often | 21 |
| Sci-fi ships | 12 |
| Sci-fi shot | 11 |
| Sci-fi shots | 12 |
| Sci-fi show costarring June Lockhart | 36 |
| Sci-fi show with companions, casually | 37 |
| Sci-fi sidekick, maybe | 22 |
| Sci-fi sidekick, often | 22 |
| Sci-fi sidekick, sometimes | 26 |
| Sci-fi sight | 12 |
| Sci-fi sighting | 15 |
| Sci-fi sightings | 16 |
| Sci-fi sightings: Abbr. | 23 |
| Sci-fi sights | 13 |
| Sci-fi site | 11 |
| Sci-fi skill | 12 |
| Sci-fi skipper | 14 |
| Sci-fi sky sighting | 19 |
| Sci-fi sky sights | 17 |
| Sci-fi smuggler | 15 |
| Sci-fi sound | 12 |
| Sci-fi sound effect | 19 |
| Sci-fi space travelers | 22 |
| Sci-fi space vehicles | 21 |
| Sci-fi spacecraft | 17 |
| Sci-fi speed | 12 |
| Sci-fi spin-off before "DSN" | 38 |
| Sci-fi standout | 15 |
| Sci-fi staple | 13 |
| Sci-fi staples | 14 |
| Sci-fi stealth shields (that these two scientists at Harvard actually did figure out how to make) | 97 |
| Sci-fi stock character | 22 |
| Sci-fi stranger | 15 |
| Sci-fi strip | 12 |
| Sci-fi stunner | 14 |
| Sci-fi stunners | 15 |
| Sci-fi sub skipper | 18 |
| Sci-fi subgenre featuring Victorian Era technology | 50 |
| Sci-fi subject | 14 |
| Sci-fi subject, or a 1970's dance | 37 |
| Sci-fi subjects | 15 |
| Sci-fi subjects, for short | 26 |
| Sci-fi suffix | 13 |
| Sci-fi suffix for human | 23 |
| Sci-fi swords (that my older brother actually got to use one time at this place but he had to sign a contract saying he wouldn't tell anyone where they're located) | 171 |
| Sci-fi talent | 13 |
| Sci-fi terrorizer | 17 |
| Sci-fi thriller starring Sigourney Weaver | 41 |
| Sci-fi translation device (that my uncle actually caught one of in his pond and one time he let me use it) | 106 |