Greg Cox wrote:
Yeah, you don't need to tell every viewer everything at once. Note that the opening spiel of STAR TREK ("These are the voyages," etc.) doesn't say anything about the United Federation of Planets, Starfleet, Vulcans, Klingons, the Prime Directive, warp drives, and so on.
If people are interested in the basic premise, they'll catch on to the rest in time. If not, force-feeding them all those details probably don't matter.
In the beginning, you just need to sketch things in broad strokes: "An enigmatic druid warrior teams up with a sexy cyborg to find an unearthly treasure beyond imagining!"
Sometimes these things are easily guessable and predictable, from such buzzlines and genre descriptions. (Or the back cover description of a novel).
There's also the time-honored "X meets Y" formulation.
"It's BUFFY meets DEADWOOD."
"It's GOSSIP GIRL with elves and fairies!"
"It's THE SOPRANOS--in space!"