Blade: Trinity is a 2004 American vampire Marvel Comics action film, written and directed by David S. Goyer, who also wrote the screenplays to the first two Blade films. It is the third film in the Blade trilogy, following on from Blade and Blade II and it is based on the Marvel Comics character Blade, played by Wesley Snipes. The story continues in Blade: The Series.
The film begins with an opening narration about Dracula:
In the movies, Dracula wears a cape and some old English guy always manages to save the day at the last minute with crosses and holy water.
But everybody knows the movies are full of shit.
The truth is, it started with Blade and it ended with him. The rest of us were just along for the ride.
The film starts with a collection of vampires looking for “Drake”, a.k.a. Dracula (Dominic Purcell) They find him in Syria in a tomb where he retreated to sleep for a time. He is ultimately woken by the group.
The vampires succeed in framing Blade (Wesley Snipes) for the killing of a familiar posing as a vampire. A few days later, the FBI attack the hideout. During the siege, Whistler destroys the hideout after being mortally wounded and dying in the ensuing explosion. With his mentor gone Blade allows himself to be captured.
As the police prepare to hand Blade over to a group of vampires, Blade is rescued by Hannibal King (Ryan Reynolds) and Abigail Whistler (Jessica Biel). The two head a group of vampire hunters called the Nightstalkers, formed by Blade’s mentor to assist him. King and Abigail reveal that Danica Talos (Parker Posey), who was the vampire who bit King, has located Drake. Talos hopes that by resurrecting him, Drake will help save the vampire race by producing more daywalkers, and eliminate Blade. In his first confrontation with Blade, Drake shows a sort of affinity for Blade, as they are both “honorable warriors” (ironically, while Drake is delivering his speech about honor, he is hiding behind a baby he has taken hostage; however, he appears to consider humans as unworthy of any consideration unless they first prove themselves). During the chaos, King is incapacitated by Drake.
Blade eventually learns of a bioweapon the Nightstalkers had created called Daystar; a virus capable of killing every single vampire in the world. However, there are two catches: The first is that Drake’s blood must be infused with the virus. As he is the first vampire, his DNA is still pure, which, infused with Daystar, will make it work to its maximum efficiency. The second: the virus has a possibility of killing Blade, since he is half-vampire.
Blade and Abigail learn of the vampire “final solution”, which involves a warehouse where several homeless humans being kept “alive” in a chemically induced coma, trapped in body bags. This keeps in line with vampires needing live food sources if the entire vampire race were to take over the world. Blade has all of them put out of their misery, shutting down their life support.
The two return to find the Nightstalkers have been all but wiped out. The only exception is King who has been kidnapped by Drake and a young girl named Zoe (Haili Page), the daughter of one of the Nightstalkers. Blade and Abigail go to the Talos building to save their friends.
Meanwhile, King is chained and tortured for information about Daystar. When this fails to get any information from him, Talos threatens that she will bite King and leave him to feed on Zoe. Blade and Abigail eventually enter the building and the fighting begins. Abigail kills Talos’ brother Asher (Callum Keith Rennie) and King kills Jarko Grimwood (Triple H) while Blade engages Drake in a sword battle. In the end, Blade impales Drake with the Daystar arrow, and releases it into the air, killing all the nearby vampires, including Talos. As Drake dies, he praises Blade for fighting with honor and tells him that through Blade the vampire race will survive. Dying, he offers Blade a “parting gift”, he also warns him the thirst will eventually win.
From here there are multiple endings:
- Theatrical ending: As Blade fought honorably, Drake gives him a “parting gift” by transforming his body into a replica of Blade’s just before he dies. The FBI captures the body of who they think is Blade and thus call off their manhunt for Blade. In the morgue Blade’s body reverts into that of Drake’s. Hannibal’s voiceover tells the viewer that Blade is still out doing what he does, and that the war will never end.
- Unrated ending: The body captured by the FBI is Blade, but he’s not really dead. He sits up abruptly in the morgue, attacks the FBI agents, and appears ready to bite a nurse on the neck. The ending is ambiguous as to whether Blade retains his humanity or gives in to his vampire thirst, thus becoming the new vampire messiah as Drake predicted. This is the ending seen on the director’s cut of the film, and commentary on the DVD indicates it was the ending director Goyer intended. 
- Werewolf ending: The Daystar virus circles the globe and wipes out all vampires. Blade walks off into the sunset, his long battle finally over. The final shot is of the Nightstalkers battling a new enemy… werewolves. This version of the ending was used in the novelization of the film and is included on the DVD as an extra, however it was rejected for use in the film itself early on in production, due to similarities to the vampires versus werewolves in the Underworld series, the discontinuity with the back story, and for simply being too silly in Goyer’s opinion.