Warning: Minor spoilers may follow.
With most movies — especially comic book movies — the overall plot comes down to good guys vs. bad guys. Good vs. evil. But there are those rare times where the heroes and villains of the story have a common interest, and that results in interesting scenes and sequences where the antagonists form a necessary truce with the protagonists.
The recently released Suicide Squad has a whole team of comic book villains banding together to work for the government, or else suffer fatal consequences at the hands of the stern Amanda Waller. The plot is a fresh new take on the superhero genre, but there are other widely-loved movies where the baddies have helped out the good guys on important occasions.
10. Captain Barbossa — Pirates Of The Caribbean: At World's End
Despite being killed by Captain Jack Sparrow at the end of the first Pirates movie, Captain Hector Barbossa is brought back to life by the mystical Tia Dalma to help Sparrow fight Davy Jones in a terrific piratey finale.
In the first film — The Curse of the Black Pearl — Barbossa is the worst of the worst when it comes to pirates. He and his crew of undead skeleton pirates stormed Port Royal, kidnapped Elizabeth Swan, and planned to sacrifice her and her pirate medallion to end their eternal curse. Yet once he is brought back, he and Jack Sparrow have their conflicting banter, but Barbossa is integral in the defeat of Davy Jones' crew.
9. Inigo Montoya And Fezzik — The Princess Bride
Even though I've repeatedly stated that The Princess Bride is hands-down my favorite movie of all time, I had to rate this so low on the list because when you think of the movie as a whole, Inigo and Fezzik are commonly regarded as heroes of the film. However, their feats weren't exactly noble.
Near the beginning of the film, the two worked for the devious Vizzini, who had them assist in kidnapping Princess Buttercup. Sure, it was just a job for them, but both of them ended up fighting Westley — the real hero — to the death.
After their employment to Vizzini comes to an end, they see their chance for nobility and they rescue Westley in order to foil Prince Humperdink's marriage to Buttercup. Their assistance to their recent enemy worked perfectly, and with their combined efforts they were able to live their happily ever afters.
8. Severus Snape — Harry Potter and the Deathly Hallows Pt. 2
Yes, yes, I know. By the end of all eight Harry Potter movies we learn that Snape was just a double agent the whole time. But come on, the guy killed Dumbledore. From the very first movie he had been that sinister professor that Harry had pegged as a bad guy. As the movies progress, we grew more and more sure of Snape's villainy, until the heart-wrenching moment in Deathly Hallows Pt. 2 where we learned of his true intent.
Even though he killed Dumbledore and served Voldemort, his last action before death was to give Harry his memories so that Harry could obtain the information he needed to confront He-Who-Shall-Not-Be-Named. With Snape's final heroic action, he helped lead Harry Potter to victory.
7. Loki — Thor: The Dark World
Loki: He's the villain that we love to hate. Or maybe we just flat out love him. His intelligence and deception has not only outsmarted Thor, but all of the Avengers. He is widely known as the best villain in the Marvel Cinematic Universe, and all Marvel fans are looking to see more of his villainy in next year's Thor: Ragnarok.
While we love him as a villain, we were treated to seeing him in a different light when he helped Thor outsmart Malekith. He even saved Thor's life when he was getting his tail-whipped by Kurse. When he died (kinda) in the battle, I for one was more sad than I was when Coulson died (kinda) in The Avengers. However, with an awesome plot twist, the movie showed us that he's very alive, and now in a very powerful position.
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6. Khan — Star Trek: Into Darkness
Whether you loved Into Darkness or not, Benedict Cumberbatch's stellar performance as Khan really stole the show. He spent the entire movie killing people with his hands, killing people with guns, and killing people with explosions. Even though he killed so many people, he still showed some mercy to Kirk and his crew. For a while, anyway.
When Kirk and the Enterprise crew finally tracks down Khan, they are met with angry Klingons who naturally want them dead. Luckily for them, Khan shows up and slaughters the Klingons (with style I might add), and then surrenders to Kirk. They then temporarily team up and launch an attack on Admiral Marcus' ship, though Khan betrays him shortly after. The alliance was nice while it lasted.
5. The Suicide Squad — Suicide Squad
Unlike the other choices on this list, the Suicide Squad didn't decide to fight for good because they had common interests or a change of heart. They fought because Amanda Waller threatened to explode their heads if they didn't follow orders.
Nevertheless, the Squad teamed up to fight a greater evil, one that threatened to destroy all of humanity. Whether Amanda Waller is considered a "good guy" or not is up for debate, but the point is that trained killers and psychopaths followed government orders to fight other bad guys. That didn't mean that they played nice.
4. Nux — Mad Max: Fury Road
The Wasteland in Mad Max: Fury Road is full of lunatics. Immortan Joe and his War Boys presided over all, hoarding all of the water and fuel to make the peasants beg at their feet. When Max and Furiosa teamed up to escape Joe's tyranny, they ended up recruiting one of the War Boys: Nux.
At the beginning of the film, Nux was completely loyal to Immortan Joe, but after he snuck on the back of Max and Furiosa's rig, he started to have a change of heart. He started to develop feelings for one of Joe's wives, and he helped them escape Joe's pursuit team. In the movie's finale, Nux even went above and beyond, and made a brave move to stop Joe's army once and for all.
3. Magneto — X-Men: Days of Future Past
Magneto is up there with Loki and The Joker when it comes to supervillains in movies. He has fought against the X-Men in virtually every movie in the series. Even though he allied himself with the X-Men briefly in X2, Days of Future Past was the moment where Ian McKellen's Magneto showed how much help he could really be.
While his younger self was causing trouble, the older Magneto used his metal-manipulating powers to defend against the invading Sentinels. He even gave his life to buy Wolverine more time, which is saying a lot considering how many times he's tried to defeat the X-Men.
2. T-800 — Terminator 2: Judgement Day
In the original Terminator movie, Arnold Schwarzenegger played a robotic killer sent back in time to kill Sarah Conner. At the time, he was one of the scariest villains in movies. In the sequel, an even more deadly Terminator was sent back, and Arnold reprised his role once again. This time, in a protective role.
All of the skills that made him so relentless in the first film were used in defense of John and Sarah Conner when the T-1000 attempted to kill them. Even though Judgement Day is widely regarded as a superior film to the first, that doesn't change that Arnold's character started out as an evil robot before he became the Conner's greatest ally.
1. Darth Vader — Return of the Jedi
When you think of classic movie villains, Darth Vader always comes up in conversation. Always. He was the face of the Empire that struck fear across the galaxy. He was one of the last and most powerful of the Force-users, and he used a Death Star to destroy his own daughter's home planet. That doesn't mean that Vader didn't have a soft side.
In the unforgettable finale of Return of the Jedi, Emperor Palpatine used his deadly Sith lightning to torture Luke Skywalker, intending to kill him. Upon seeing the torment caused to his own son, the light side gripped Vader and caused him to kill his master by tossing him down a reactor shaft. His sacrifice brought about the end of the Empire and secured victory for Luke and the Rebels. He may have led his life in evil, but in his last moments he showed his good side once more.
Not all villains want chaos in the world like the Joker. Some have their own plans for the world, and sometimes those plans mean engaging in non-villainy for a short time. That being said, just because the bad guys help out the good guys once in a while, that doesn't mean that they don't have a whole life of evil-doing ahead of them.