bottle episode
noun
plural bottle episodes
: an inexpensively produced episode of a television series that is typically confined to one setting
After weeks spent in the field, The Last Ship got back to basics tonight by delivering a very satisfying bottle episode that kept everyone situated on the ship.—Merrill Barr
The six-part series is made up of mostly "bottle episodes," meaning the action takes place in one location. While that situation is a facility of a small budget, it has turned out to be a bit of a creative windfall.—Dana Gee
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Merriam-Webster unabridged
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