Ending twist spoiler-free!
Also, I won't be uploading any more full episodes. Sorry. Check here first: http://www.cbs.com/classics/the_twilight_zone/index.php
If they're not there, pirate them. arrrr

10. The Dummy
9. The Little People
8. Nightmare at 20,000 ft
7. Eye of the beholder
6. Person or Persons Unknown
5. The Obsolete Man
4. Number 12 Looks Just like you
3. The Lonely
2. The Midnight Sun
1. Five Characters in Search of an Exit

Honorable mentions:
Time Enough at Last, Living Doll, Where is everybody?, The New Exhibit, Two, One More Pallbearer, Valley of the Shadow, Miniature, Steel, Mirror Image, The After Hours, To Serve Man (less info)