* DuelingShows: With ''Series/TheTwilightZone'', though both were in production only during ''Twilight Zone's'' final season. In the end, ''Twilight Zone'' lasted for five years while ''The Outer Limits'' ended after two. On the other hand, the 1990s revival of ''The Outer Limits'' lasted nearly twice as long as both revivals of ''The Twilight Zone'' combined.
* FranchiseKiller: The original series was abruptly cancelled mid-way through the second season due to poor ratings, although it would gain another life in syndicated reruns, and get a long running revival series decades later.
* HeyItsThatGuy: Like most other [[GenreAnthology genre anthologies]], both series feature a host of recognizable actors, often before they became famous. There is at least one of these in EVERY episode, often two, sometimes three, and occasionally (like in the Showtime series finale) even more.
** In the original series: Eddie Albert, Creator/EdwardAsner, Robert Culp, Creator/BruceDern, Creator/JamesDoohan, Robert Duvall, Carroll O'Connor, Creator/DonaldPleasance, Creator/WilliamShatner, Creator/MartinSheen, Grace Lee Whitney, etc.
** In the {{revival}}: Creator/AdamBaldwin, Creator/ClancyBrown, Nicole De Boer, Creator/KimCoates, Creator/NathanFillion, Creator/MarkHamill, Creator/NatashaHenstridge, Creator/CharltonHeston, Jack Klugman, Music/MeatLoaf, Robert Patrick, Lou Diamond Phillips, Jason Priestley, Creator/RyanReynolds, Creator/BrentSpiner, Creator/WilWheaton, etc.
** In both series: Creator/LeonardNimoy, Cliff Robertson.
** Creator/AdamWest and Ted Knight both appear in the TOS episode "The Invisible Enemy". Sadly, they have no scenes together.
** One {{revival}} episode featured Terri Hawkes, the English voice actress for ''Anime/SailorMoon''.
** HilariousInHindsight: Another revival episode featured Creator/CathyWeseluck as a robot boy [[WesternAnimation/MyLittlePonyFriendshipIsMagic who really wanted to ride on horses.]]
** Another revival episode featured both [[Series/StargateSG1 Don S. Davis and Beau Bridges]] (albeit via flashback) in the same episode.
* PropRecycling: Happens often in the original series. Even some of the alien costumes were reused, both in ''The Outer Limits'' itself and other shows (such as ''Series/StarTrekTheOriginalSeries'').
* SimilarlyNamedWorks: The {{revival}} episode "The Human Factor" is ''not'' a remake of the TOS episode with the same title.
* VindicatedByCable: The first season was fairly popular in its day, but season 2's hit or miss quality (along with a fatal timeslot change) caused it to take a nosedive and be cancelled. Fortunately, the show managed to gain a decades-long life and recognition in syndicated reruns.
* WhatCouldHaveBeen:
** The 1998 version of ''Series/TheOuterLimits Companion'' includes an appendix which provides detailed plot synopses of TOS scripts and premises that were never filmed. It also has details on rewritten and {{Deleted Scene}}s from the finished episodes.
** "The Forms Of Things Unknown" was written by Joseph Stefano with one eye on making it his directorial debut, but it ended up being helmed by Gerd Oswald (Stefano's only directorial effort came after he left the series, with the unsold pilot ''The Ghost Of Sierra De Cobre'').
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