12 Movie Sidekicks Who Betray The Hero

In a now-famous scene, Neo is offered the choice between gaining knowledge and realizing the life he currently leads is a lie, or forgetting anything ever happened and going back to normal. It's a movie, so of course, Neo picks to have his life as he knows it changed, but there's a lot to be said about going the other route.

Instead of living out a comfortable existence in a pleasant simulation, Neo has to spend his life inside of the ruins of Earth, where he exists as part of a small crew on a spaceship. This obviously isn't the life for everyone, including the crew member Cypher, who sells out his entire crew just so he can go back inside the Matrix and forget about the whole resistance thing. 

Scud is a geeky tech expert who Blade rescues and then allies himself with in Blade II. The fact that their relationship begins thanks to an act of kindness on the part of Blade makes it even more evil that Scud is able to betray him later on. 

Basically, after spending the film fighting vampires together, Scud reveals he's one of the vampire's familiars during a fight with the vampire big bad. Luckily, Blade already suspects this, and he makes sure that a bomb Scud thinks is fake is actually real, then uses that bomb to blow Scud up. 

Dawn of the Planet of the Apes shows a world that has been dramatically altered in the years following Rise of the Planet of the Apes. Human society has collapsed following the outbreak of the Simian Flu. Meanwhile, the ape society continues to grow in the forests outside of San Francisco. 

In Dawn, a group of humans breaches ape territory to restart a dam. The ape leader, Caesar, allows this breach, and the small group of humans working to restore the dam begin to bond with the apes. This irritates Koba, one of the higher-ups in the ape community, and Koba decides to take matters into his own hands by wiping out some of the humans. Koba then goes as far as to shoot Caesar because he believes a stronger ruling hand is required to deal with the humans.

Although he's an old friend of Indiana's dating back years, Mac's first appearance in the franchise is in the opening to Kingdom of the Crystal Skull. Mac is first seen being pulled out of the back of a trunk by a Soviet officer, alongside Indiana Jones. The Soviets then take Indiana and Mac to a warehouse, where they're told to point out an alien corpse that Indy worked on years before. While in the warehouse, Indy attempts to make his escape, but he quickly finds that one of the guns pointed against him is held by Mac. Apparently, Mac has long been on the KGB payroll, and he helped get Indy captured by the Soviets in the first place. 

Mac gets to betray Indiana Jones a second time in the same film, as he later lies to him about working for the CIA as a double agent. But, once again, the moment the Soviets show back up, Mac betrays his supposed pal.

After a targeted strike wipes out all of the Kingsmen except Eggsy and Merlin, the duo travel to the US to seek help from their American counterparts, the Statesman. Once there, Eggsy, Merlin, the miraculously still alive Harry, and a Statesman named Whiskey begin working to solve an international drug operation. 

Along the way, Harry suspects Whiskey of being a traitor and shoots him in the head. That would have solved a lot of problems, but Eggsy uses advanced technology to bring Whiskey back. Later, Whiskey reveals that he is, in fact, working for the bad guys because he hates drug users ever since one killed his wife and kids. So, Harry and Eggsy drop Whiskey into a meat grinder, and that's that. Two deaths for one betrayal.

Truman is the unwitting star of a reality show that films every moment of his life inside of a fake town. Truman has no idea any of this is happening, so the entire thing is rather immoral. There are a lot of people who should feel guilty about their treatment of Truman, but the closer those people were to him, the worse they should feel. 

One of those people who's close to Truman is Marlon, his best friend. In one particularly intense scene, Truman is starting to figure out what's going on, and he expresses as much to Marlon. Marlon assures Truman that nothing weird is going on, even promising: "The last thing I would ever do is lie to you."