Related Clues:

• Shiver-inducing
• Uncanny, and a bit spooky
• Quite strange
• Unpaired
• Like ''The X-Files''
• Missing a few marbles
• Uncannily spooky
• Unsettlingly strange
• Kind of duck
• Like ''The Shining,'' e.g.
• Really spooky
• Like all primes but one
• Lacking a match
• Atypical
• Like most Serling stories