The Tholian Web
Written by Judy Burns
and Chet Richards
Directed by Herb Wallerstein,
Ralph Senensky (uncredited)
Season 3, Episode 9
Production episode 3x9
Original air date: November 15, 1968
Stardate 5693.2
Trivia
William Ware Theiss designed the silver lamé environmental suits featured in this episode. They featured a fabric helmet with screen mesh visor that made it easier to shoot the actor’s faces while allowing them to breathe. Unfortunately, they did not include a zipper and the suits had to be removed in their entirety if Nimoy, Kelley or Shatner wanted to go to the restroom. Source: classictrek
Sources:
(1.) http://www.tor.com/blogs/2010/12/star-trek-re-watch-the-tholian-web
http://www.startrek.com/database_article/tholian-web-the
http://en.memory-alpha.org/wiki/The_Tholian_Web_(episode)
http://en.wikipedia.org/wiki/The_Tholian_Web