Sam is making a sauce better than all sauces by mixing a bunch of sauces. Cat tries it and then spits it all over Sam's shirt. Dice runs in and says that he was recently playing poker with BJ Malloy, Randy, a spear fisherman named Brody, Tandy, and some other guy. Brody bet Dice all the tuna. Dice believes that he was talking about money and wins the bet. However, it turns out that Brody really meant Kansas Razorback Tuna, not money. He can't sell them because they taste terrible when cooked. Sam goes to get another shirt and then, Cat's friend from Hollywood Arts, Jade West, arrives to work on their school project. Cat keeps her out. Dice asks why. Cat says that it was because Sam and Jade's personalities were similar and if they ever met, they would kill each other. Sam comes back with another shirt just as Jade comes back in. Sam and Jade say hi to each other, causing Cat to pass out. When she wakes up, she hears violent noises and voices. She thinks Sam and Jade are beating each other up but they're actually playing a video game involving bats. Sam and Jade are really hitting it off. Sam, Jade, and Cat go to Fisherman's Wharf, where Dice is keeping his tuna. Sam plans to jump the tuna. Cat doesn't want Sam to do this. Sam and Jade go to get some food.
Sam and Jade's friendship continues, but Cat feels left out. Cat tries to make them jealous by hanging out with Dice and Nona. Predictably, this doesn't work. Nona says that where she came from, if someone's friend got stolen, they would steal a friend of theirs. This gives Cat an idea. While Sam takes a shower, Cat steals Sam's phone and calls Sam's friend and ex-boyfriend, Freddie Benson. Cat says that Sam got run over by a sports utility vehicle and now had fractured bones, bleeding gums, and broken buttocks. Freddie, who was at his apartment in Seattle, quickly goes to L.A. The next day, he arrives at their apartment. Cat flirts with Freddie and then starts hanging out with him. They eat lunch at Bots and Sam and Jade, who are also at Bots, sees them. Cat tries to make Sam jealous now that Sam saw Freddie and Cat then brings Freddie somewhere else. Sam is angry with Cat, so Jade shows Sam a picture of her friend, Robbie Shapiro. All Sam has to do to get even with Cat is to start hanging out with Robbie. Later, Freddie and Cat walk in on Robbie singing a song he wrote called "I Think You're Swell" to Sam. Cat stops him. She is furious because Robbie had dedicated that song to her and performed it to her over a year ago. Sam and Cat argue about stealing each other's friends and finally, Cat says that she can jump the tuna if she wants and Cat doesn't care what happens to her.
On the night where Sam is scheduled to jump the tuna at Fisherman's Wharf, Sam looks for her gloves. Cat shoves Sam in the closet and locks the door. Cat tries to save Sam's life by taking the motorcycle Dice got for Sam and going to Fisherman's Wharf. There, Cat pretends to be Sam. Meanwhile, Freddie and Robbie go to watch the jump in a crane above the tuna tank. Sam slams her way out of the closet and tries to save Cat's life by stopping her. She gets on her old motorcycle and rides to Fisherman's Wharf just as Cat is about to jump the tuna. Cat rides toward the tank but falls. Freddie and Robbie, who are in the crane, fall into the tank. Sam sees Freddie in the tank and jumps in. She saves his life, but leaves Robbie in there. Cat tries to save Robbie but she runs into the tank. Freddie and Robbie are severely injured. Sam suggests to Freddie that they go out to dinner after he heals and Freddie agrees. Robbie asks Cat if they can go out together and Cat agrees. Robbie then starts singing "I Think You're Swell" again, but Freddie, muffled by his bandages, yells and calls the nurse.
From:
http://samandcat.wikia.com/wiki/The_Killer_Tuna_Jump