Related Clues:
- Unwelcome sight on an apple
- Sci-fi subject, or a 1970's dance
- Plot device in some science fiction
- Fictional travel aid
- Fictional portal
- 'In one era and out the other' phenomenon?
- Theoretical passageway in space
- Dance in 'The Rocky Horror Picture Show'
- Dance in which 'you bring your knees in tight'
- One's bored, not having broken up - there's nothing jolly in that!
- Underground passage undamaged with class heading off into it
- Where past conditions are preserved intact
- State where features of the past are present
- Space made by burrowing limbless creature
- Hypothetical distortion of the fourth dimension