This has got to be my favorite relationship of the trilogy. You have two interesting characters and when you put them together it's only better. They both have common interests but in reality they are complete opposites. The viewer wouldn't think that they would get along, or work together but they sure did. Stu was pretty much a lapdog of Billy’s, like Randy called him, Billy was far more independent. And though Billy wasn't exactly sane, he was the one that had to keep the sanity in their relationship. Stu was how you say very obviously unstable, but it worked for him. People just thought he was a wild and crazy, fun-loving guy, though as time went on we got to see there was much more going on than meets the eye. And Billy had major issues too, but was much better at masking his unstableness than Stu. I really loved watching them interact in the first film.

We are introduced to Billy Loomis when he climbs in through his girlfriend Sidney's bedroom window. We learn that they have been dating for two years and that their relationship had taken a turn for the worst when Sidney's mother Maureen was brutally raped and murdered almost a year ago. Billy was concerned that the relationship was losing its fire. We first meet Stu the next day at school. They all discover that two students, Casey and her boyfriend Steve, were both savagely murdered. Sidney’s friend Tatum pretty much says how it's even worse than Sidney's mother's murder. Sidney, Tatum, Billy, Stu and Randy were sitting and discussing the murders after they had all been interrogated. (The police were clueless and we’re questioning everyone pretty much.) Randy points the finger at Stu. He used to date Casey. Stu said he dated her for about two seconds, and then Randy pointed out how that was because Casey had dumped him for Steve. Stu denied it. Stu and Randy get into a conversation about the murders and go into way too much detail of the murders and making jokes about it for Sidney to take, and she leaves.

A little past 7:00 that same night, Sidney gets a call just like the one Casey Becker got before she was murdered. After taunting Sidney for a while, the caller ends up getting into her house and here we see someone in a black Halloween costume with a ghost-type mask. He chases after and almost kills her but she manages to get into her room and use her computer to call 911. Shortly after that Billy comes in through the window again, and she hugs him. He ends up dropping a cellular phone and she freaks out, now thinking he is the killer. The police take him away and he is questioned. Sidney goes to Tatum's house and there she receives another phone call. The caller says she framed the wrong guy, again (meaning she accused the wrong man of killing her mother). Billy is released since he couldn't have made that call in jail. The next day at school she runs into Billy. They talk for a bit, he tells her that police said he must have scared off the guy that was trying to kill her. Their conversation doesn’t last long because she ends up getting angry with him over his insensitivity about the loss of her mother and why she’s so freaked.

The next day we find out Stu is having a party. Before the big party, Stu is at a video store. He is talking with Randy, who is also there because he works there. Billy is there too, in the horror section. Randy comments about how Billy really shouldn’t be standing in a horror section when he’s a suspect for all these brutal murders. He’s also convinced that Billy really is the killer. Stu tries to convince him that Billy is not and then tries to point the finger at Sidney’s father. Randy says the father is a red herring. Billy then sneaks up behind Randy and starts integrating him a bit. Questioning him about how they are supposed to know that he is not the killer.

We next see Billy at Stu’s party. There he runs into Sidney. They make up, and bada bing bada bang, Sidney is no longer a virgin. After they’re through she asks him who he called when he was at jail. He said his dad but his dad was already at the jailhouse. Billy says he didn’t get through. He questions if she still thinks he is still guilty. She denies it and moments later someone in a killer costume comes in and attacks Billy. After some running around and more deaths, Sidney runs into Stu and Randy who are both pointing the finger at each other, trying to convince Sidney the other is guilty and they are the innocent ones. Sidney leaves them both outside and shuts the door to find Billy wobbling his way down the stairs, covered in blood. She goes to him, he asks for the gun she had been holding, and she gives it to him. Randy walks inside yelling about how Stu had gone mad. Billy turns to him with a sadistic smile and mutters the words We all go a little mad, sometimes. He shoots Randy. Billy licks "the blood" off his fingers and tells her that it is corn syrup, the same stuff used for the pig blood in the movie, Carrie. We now know his death was a set up.

Sidney sees that Stu is also in the room, she runs to him, but it's not long before we find out that he too is involved with the killings, when he reveals and uses the voice changer that the killer used to disguise his voice. Billy and Stu reveal that they had killed Sidney’s mother a year ago that night. When asked why they had done it, Billy went on about how it’s better without a motive. But then he said the reason he did it was because her mother had slept with his father and that was the reason his mother had abandoned him. He didn’t handle that well, obviously It is also obvious that Stu had no idea that, that was the real motive behind Billy’s actions. He seemed taken aback, but like all of Stu’s emotions, it didn’t last long, and the next second he was back to grinning like a, well, like a psychopath.

They reveal their plan to her, which involved framing her dad for the murders. They had kidnaped him when he was going on a business trip. They cloned his cellphone to make it look like he was making the calls. It fit. The anniversary of his wife’s murder was coming up. Sidney’s father lost it and went on a killing spree. Killing everyone in his path, his daughter, and then himself. Billy and Stu were going to be the only survivors. They each stabbed each other (which got very out of hand) to make it look authentic. Before that, Stu had put the voice changer and the cellphone is Sidney’s father’s front pocket. They planned to kill Sidney and her father and make to look like they had been left for dead. But then Gail Weathers (a reporter who had been at the party) busted in on them and stole the gun (that had been on a counter in the kitchen at that time) while Billy and Stu were confessing everything to Sidney. She went to shoot him but forgot about the safety and it wouldn’t fire. Billy knocked her out with the gun and was getting ready to shoot her and Dewy (a police officer who was also at the party).

It was then that Stu noticed Sidney had fled during that little encounter. The phone rings, Billy answers it, and it is Sidney using the voice changer that she had snatched. She says she had called the police. Billy freaks out and Stu has lost so much blood that he’s functioning way worse than normal. He picks up the phone and she asks him what he’s going to tell the police when they arrive.. Why he did it. He says he will answer with peer pressure. Meanwhile, Billy is frantically searching for Sidney. He goes to open the closet and she comes out, now wearing the killer costume, and stabs him a couple of times with an umbrella. Stu goes after her and she ends up electrifying him with a tv. Randy was there now, still alive, much to his surprise. Billy, also still alive, attacked Sidney, almost killing her. Gail had became conscious again, took Dewey’s gun and didn’t forget the safety that time. Randy made a comment about how this would supposedly be when the killer comes back for one last scare. Billy does and Sidney uses the gun Gail did and shoots him in the head. And there ends the greatest relationship (in my opinion, of course ;)) of the Scream Trilogy.