sub-trope of Omniscient Morality Licence sub-trope of Retcon.... Needs More Examples The Story has rules; in one episode, they change the Rules and never mention that change again, evah! Live-Action TV
- The Trope Namer Star Trek Voyager: "The Disease". after a million episodes of Kirk explaining to Green-Skinned Space Babe the thing we humans call Love, and Ryker explaining Love to both space babes and space dude and Paris reverting to explaining Love to space babes, Harry Kim sleeps with ONE alien, so Janeway asspulls the minus infinity directive that Star Fleet forbids all fraternization. This regulation is never mentioned again.
- Justified in "The Omega Directive" because it was the only episode when they encountered Omega particle.
- Retcon-ned: TNG rules defined Warp 10 as the maximum, Janeway and Paris travelled at Warp 20, turne into salamanders and the Doctor healed them. Never mentioned again.
- Zig-zagged in Buffy the Vampire Slayer: Season 3, there is a big deal that Slayers are forbidden to kill Humans, but the rules about Humans killing Humans are deliberately left vague; Season 5, Buffy kills 10 Knights of Byzantium; resolved in season 6 YMMV.
Hello, Unknown Troper. You'll need to get known to lend a hand here.