In many ways, "The Hungry Glass" reminds me of the famous William Shatner "Twilight Zone" episode with the monster climbing on the wing of the airplane ("Nightmare at 20,000 Feet"). Both feature him obsessed about some terror that others cannot see and both feature him acting very broadly. The "Twilight Zone" episode worked very well...whereas "The Hungry Glass" didn't. I think much of it was because the episode would have worked better had his acting been more subtle. While I really like Shatner normally, here the director should have asked for LESS.
The episode finds a young couple buying an old house on a cliff. When they discover tons of old furnishings in the attic, they think it's their lucky day. Little did they know that their mirrors were evil and cursed!
The ending, to me, seemed really over-the-top and silly. A much better "Thriller" episode about mirrors is "The Prisoner in the Mirror"...."The Hungry Glass" is, in contrast, barely worth it as a time-passer.