Some movie trailers keep viewers on pins and needles until the movie is released. The brilliant viral previews for “Deadpool,” the original “The Blair Witch Project,” and the upcoming “Fantastic Beasts and Where to Find Them” are cases in point.

Some are so good they snared audiences even though the movies were disappointing — “Suicide Squad,” “9,” “Prometheus.”

No need to see “Underworld: Blood Wars” now.

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Conversely, some trailers are so bad they nearly kill the movie before release: There was 2016’s “Ghostbusters,” for instance, the first trailer of which gave the impression the movie consisted mostly of green ghost barf. Or “Bridge to Terabithia,” which made the movie look like a bland ripoff of “The Lion, the Witch, and the Wardrobe.”

And then there are trailers that give away so much of the movie that seeing the movie itself is anticlimactic at best.

Case in point: the recently released trailer for “Underworld: Blood Wars,” the fifth installment in the vampires vs. werewolves franchise. Oh, the usual gripes apply — it’s just another gore fest, with ancient enemies brandishing all-too-modern weapons; at least half the audience will be there simply to ogle Kate Beckinsale running around in skin-tight latex and leather.

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But the trailer tries not only to encapsulate the first four chapters (yes, we know vampires and werewolves have been playing Hatfields and McCoys for thousands of years), it also tells too much of the plot. Beckinsale is still trapped between the werewolves and the vampires who betrayed her; her only allies are her hybrid vampire/werewolf progeny (Theo James) and his father (Charles Dance). She may have to make the ultimate sacrifice to end the eternal war.

Sorry if you planned to go see it.

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Giving away the whole movie in the trailer is nothing new. Take 1973’s “Soylent Green.” “WHAT IS THE SECRET OF SOYLENT GREEN?” the trailer thunders repeatedly.

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Well, let’s see: In a dystopian future, an overpopulated world teeters on the brink of famine, its only salvation government-supplied protein crackers called Soylent Green. Shortages are causing panic and riots, but the government assures us they have a bottomless supply of Soylent Green. But WHAT IS THE SECRET OF SOYLENT GREEN? Charlton Heston plays a cop who stumbles into a Soylent Green factory with corpses being fed into a machine — and Soylent Green crackers coming out of the machine. So: WHAT IS THE SECRET OF SOYLENT GREEN?

“Soylent Green is people!” Heston bellows. “You’ve gotta tell everyone!”

No, we don’t. The trailer already did.

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The “Terminator” franchise has suffered from similar overgenerous trailers, perhaps due to studio execs fearing they’re close to milking the franchise dry. In “Terminator Genysis,” the plot hinges on mankind’s savior John Connor (Jason Clarke) being replaced by a Terminator. So does the trailer. In “Terminator Salvation,” protagonist Sam Worthington’s character discovers to his horror that he himself is a Terminator — which would have been a fascinating surprise, if it hadn’t been given away in the trailer. Twice.

Say what you will about M. Night Shyamalan’s overstrained plot twists — at least the twists aren’t revealed until you actually watch the movie. Unlike 2011’s “Dream House,” in which a troubled man (Daniel Craig) is trying to bond with his family, only to discover they’re all dead and he probably murdered them himself. The movie was a flop, quite possibly because audiences saw no need to waste money on a ticket when they already knew the plot from the trailer.

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A similar fate befell 2011’s “Insidious,” in which young parents fear for their son’s sanity after terrifying supernatural disturbances drive them from their home, but learn too late that, as the trailer puts it, “It’s not the house that’s haunted; it’s your son!” And audiences stayed home in droves.

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Here are some other movies that gave it all away in the trailer:

“Speed”: Can Keanu Reeves get all the passengers off the bus safely? Why, yes — we actually get to see them watching the empty bus explode at a safe distance. Also, there’s a surprise subway scene at the end. Sssh!

“The Impossible”: An everyday family is caught in the 2004 tsunami! Will they survive? Yep.

“The Sum of All Fears”: “The bomb is in play! THE BOMB IS IN PLAY!” Will our hero find the nuke in time? “BOOOOOOOM.” Nope.

“Children of Men”: Mankind is dying out because no one can get pregnant anymore. “What’s left to hope for?” wonders Clive Owens. Would have been a great trailer if it stopped there. But it doesn’t, and we see someone gets pregnant after all.

“Contagion”: This film was supposed to shock audiences by killing off a major star (Gwyneth Paltrow) early in the movie. Hey, Hollywood! You know why Hitchcock startled everyone when he killed off Janet Leigh in “Psycho”? Because he didn’t blow the surprise in the trailer.