bottle episode

Etymology
Said to be from the term “ship-in-a-bottle episode”, the nickname given by the cast and crew of the television series Star Trek (originally broadcast 1966–1969) to an episode set entirely on board the starship USS Enterprise.

Noun

 * 1)  An episode of a television series designed to be inexpensive and restricted in its use of sets, effects, cast members, etc.

Translations

 * French: épisode bouteille
 * Polish: epizod butelkowy, odcinek butelkowy
 * Russian: бутылочный эпизод