- - Writer of the 1941 sci-fi short story Nightfall
- - Isaac, author of the Foundation sci-fi book series
- - Science fiction writer returns travel permit Maureen sent in
- - one of the "big three", so i am constituted we hear
- - editor of "the hugo winners" anthology series
- - Isaac —, US author
- - Stasi moved to hold American author
- - Isaac ... author of science fiction
- - Prolific science fiction author Isaac
- - Author Isaac who sported enormous white mutton chops
- - "The Solar System and Back" author Isaac
- - Sci-fi author who was also a biochemistry professor
- - Isaac who wrote himself into "Murder at the ABA"
- - Author of "Three Laws of Robotics"
- - "The Robots of Dawn" author Isaac
- - "The Currents of Space" author
- - "Earth Is Room Enough" author
- - Big name in sci-fi books
- - "I, Robot" author
- - "Foundation" author
- - "The Robots of Dawn" writer
- - Big name in sci-fi
- - SF author
- - Isaac ------ (1920-92), Russian-American sci-fi author
- - Author of 500+ books
- - Big name in sci-fi novels
- - Sci-fi author
- - Like one film that is not shown for sci-fi author
- - Sci-fi author Isaac
- - Doctor appears in put-up travel document as writer
- - "I, Robot" author Isaac
- - Author who devised the 'Three Laws of Robotics'
- - 'The Robots of Dawn' author
- - Isaac --, US writer, born in Russia, author of 'Foundation Trilogy'
- - Author of the "Black Widowers" series of mysteries
- - Author of 1980's "The Annotated Gulliver's Travels"
- - "Puzzles of the Black Widowers" author
- - "Foundation" author Isaac
- - "The Caves of Steel" writer
- - He wrote guides to Shakespeare and the Bible
- - "The End of Eternity" author
- - Science fiction writer who formulated the Three Laws of Robotics
- - "The Gods Themselves" author Isaac
- - "The Naked Sun" author Isaac
- - "Pebble in the Sky" author
- - Creator of the Three Laws of Robotics
- - "Azazel" author Isaac
- - Author of 450+ books
- - "The Foundation Trilogy" author
- - Author of the Three Laws of Robotics
- - He coined the word "robotics"
- - Author whom Carl Sagan called "the greatest explainer of the age"
- - Author of "The Foundation Trilogy"
- - Only author represented in every major division of the Dewey Decimal System
- - "The Stars, Like Dust" author
- - "The World of Nitrogen" author
- - "Foundation's Edge" author Isaac
- - "Foundation Trilogy" author
- - "Foundation's Edge" author
- - One of the Big Three of science fiction
- - The Robots of Dawn sci-fi novelist Isaac
- - isaac ...., prolific author of science fiction including i, robot
- - writer's apostle endlessly featured in authorised version
- - Noted scholar and science fiction writer Isaac ..
- - foundation (1951)
- - Sci-fi great
- - He, Isaac, of "I, Robot"
- - "Those people who think they know everything are a great annoyance to those of us who do" quipster
- - Science fiction pioneer
- - Isaac —, sci-fi writer
- - "I, Robot" writer
- - Isaac who wrote 'Opus 300'
- - Writer Isaac
- - Writer after whom an asteroid and Mars crater are named
- - Polymathic Isaac
- - Isaac who wrote "I, Robot"
- - "Nightfall" story writer
- - Sci-fi master Isaac
- - Foundation provider when I go short
- - Sci-fi writer Isaac
- - For writer, a sort of card half-completed
- - When I'm old, very, I'll be a sci-fi writer
- - Heinlein contemporary
- - Prolific writer Isaac
- - "Nemesis" novelist
- - Giant of sci-fi
- - "Foundation" novelist
- - "Foundation" trilogy writer
- - Sci-fi's Isaac
- - Isaac of sci-fi
- - Writer who said "I am not a speed reader. I am a speed understander"
- - "Opus 300" writer
- - Prolific sci-fi writer
- - Famed sci-fi writer
- - Sci-fi master
- - Popular science writer
- - Science-fiction writer Isaac
- - See 46-Down
- - See 7-Down
- - See 12 Down
- - See 22-Down
- - War hero Isaac
- - Russian-born American science fiction writer Isaac ___ , d. 1992
- - during christmas i'm overfeeding isaac
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