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No Ship, No Adventure, Just Poker. Honestly, I'd watch that.
(startrek.website)
Basically just five seasons of the cast getting together, having drinks, and playing poker more or less in character. Call it "Galaxy [Class] Series of Poker". TV gold.
I dunno about just poker, but I’d watch a show that took place entirely on the ship (no planets of the week or big budget special effects). I loved the bottle show episodes of TNG. They were so damn cozy!