Sonny Munroe arrives in Los Angeles, anxious to meet her new cast mates on the popular sketch comedy show for teens and tweens, "So Random!" After a rocky start with Tawni, Sonny tries to impress the cast with her ideas to improve a sketch.
Sonny meets Chad Dylan Cooper of the drama series "MacKenzie Falls" in the studio's cafeteria and learns of the simmering rivalry between the two casts. When tensions arise, Sonny attempts to make a peace offering.
When Sonny's cast mates reject her sketch idea, Chad Dylan Cooper and the cast of "MacKenzie Falls" console her on their set with luxurious gifts. Now, the cast of "So Random!" must convince Sonny to return to their set.
Sonny is the only cast member that has not received fan mail, so she creates her own fan Eric. When Marshall invites Eric to set, Sonny must devise an even wilder plan. Meanwhile, Nico and Grady intercept a package addressed to Zora.
Sonny must pass her geometry test, or her mom won't let her participate in a new sketch with Tawni called "Check It Out Girls." When Tawni tells her to cheat on the test, Sonny can't do it. Meanwhile, Nico and Grady purchase a snake to impress a pretty girl on set.
When Sonny's best friend Lucy visits from Wisconsin, Tawni tags along with them making Sonny jealous. Lucy wants to go to Chad's party but Sonny wants to spend time with her friend and lies that she wasn't invited. After Tawni explains that Sonny was invited and takes Lucy instead, Sonny has to find a way to gain Lucy's trust again. Meanwhile, Nico and Grady find that a security guard is stealing their pizza and try to devise a plan to make him leave their pizza alone.
Sonny and Tawni are hurt that they've become the targets of "Tween Weekly's" gossip blogger, Sharona, so they plot their revenge on her at the "Oh No You Didn't" Awards. Meanwhile, Nico and Grady try to convince Chad to drive them to the award show in his new car.
When Sonny is interviewed by "Tween Weekly TV," Chad immediately steps in to focus the publicity on himself. Sonny, frustrated by his schemes, gets visibly angry with Chad and the cameras witness the interaction, shining poor light on her. Meanwhile, Nico and Grady sort through Tawni's trash to sell it online.
Sonny is asked out by James Conroy, a guest star on MacKenzie Falls. Tawni doesn't want Sonny to date James because her "best friend" once dated James. Sonny doesn't listen but after James dumps Sonny to ask Tawni out, Sonny and Tawni try to come up with a plan to get back at him. Meanwhile, Nico and Grady try to slurp frozen yogurt from the cafeteria without getting caught by Murphy, the security guard.
Sonny is shocked to learn that the underprivileged girl she has been giving a tour of the set is actually the bratty daughter of the president of the studio and all she wanted was to meet Chad. Unfortunately, since she is the president's daughter, Sonny has to get Dakota to meet Chad or else Sonny and the rest of the cast could get fired. Meanwhile, Tawni, Rico, and Grady are jealous that they are never in magazines so they create th fake club called "The Basement." They enjoy telling stars off until the studio president wants to go to their private club so they must find a way to make him believe he is in actually in a club instead of surrounded by sketch props.
While feeling a little bit down because she missed her prom back in Wisconsin, Sonny decides to throw a prom at the studio for the cast members of the different shows that are filmed on the same lot as So Random.
Sonny sets up Marshall and Ms. Bitterman. In the beginning, nothing changed after they started dating but after a while, Ms. Bitterman started to interfere with their sketch rehersals. Sonny is chosen to try and destroy the relationship she had started in the first place.
Chad is filming a movie about his life and lets all of the cast from So Random! except for Sonny to play themselves. Instead, he hires Selena Gomez to play Sonny. When Selena sees how Chad and Sonny act around each other, she insists that both of them like each other. They both deny it but Selena doesn't give up that easily.
Chad is the host of a new TV show called Celebrity Pranked and that gets the cast of So Random! paranoid. When Sonny gets an audition for the role of Sonny's favourite superhero "Fashionita", she gets suspicious about Chad and plans a way to get him back.
Marshall loses a bet and the prop house is given to Mackenzie Falls to be changed into their new meditation room. When the cast of So Random is told they can have any other room on the lot, Sonny comes up with a plan to get their prop house back.
Tawni starts to like a new intern so Sonny tries to help them get together. But when an unexpected bump in the road makes Tawni upset, Sonny tries to make things better.
Marshall gets Chad to guest star on So Random! No one is pleased with having to work with Chad but when Sonny finds out what kind of sketch they would be doing, Sonny starts to worry about what will happen after.
After Sonny convinces Tawni to fire her manager, not knowing it was Tawni's mom, Sonny and her mom Connie try to devise a plan to get Tawni and her mom back together. Meanwhile, Nico and Grady try to get past the new security guard and his dummy so they can use Chad's private bathroom.
Sonny gives Nico and Grady a video game chair, not knowing it would make both of them mad at each other, so Sonny tries to get both of them back together. Meanwhile, Zora tricks Tawni and Chad to go to "Giraffes on Ice" by pretending to be upset.
Zora gets challenged by the studio head's daughter, Dakota, to sell the most Blossom Scout cookies ever, and Sonny steps in to help Zora win. However, Chad helps Dakota sell more cookies so both teams try to think of ways to get more customers. Meanwhile, Nico and Grady come up with a scent to attract girls, and Tawni promises not to look in the mirror for two days.
When Sonny and Tawni are guests on "Gotcha with Gilroy Smith," Gilroy tries to get Tawni and Sonny to confess some embarrassing moments on "So Random!". Sonny and Tawni make a pact backstage that they will have each others back but they realize that there is a hidden camera so Gilroy knows about their pact and decides to use it to his advantage.
Sonny hosts a "Walk-A-Thon For Books" for kids and gives each of them Tawni's Extreme Skinny Jeans. When Chad hears of this, he then hosts a "Walk-A-Thon Against Books" and also sells the skinny jeans to compete with Sonny.
Sonny and Tawni are invited on an exchange program to Glendovia because of their Check-it-Out Girls sketch, but refuse to go together because they are mad at each other. Meanwhile, an exchange student impresses a girl Nico and Grady like, and they both think it is because of his mustache.
Feeling that Gassie doesn't get the affection that he deserves, Sonny decides to show the dog love. Meanwhile, Nico and Grady borrow money from Dakota Condor to invest in fart noise lunch boxes for "Gassie & We".
Sonny’s favorite musician, Trey Brothers, is visiting and she would like to spend time with him to show him some songs she has written. However, Tawni likes Trey and thinks Sonny is trying to steal him from her. So she says that Sonny's song is her song. But then things get more complicated when Trey steals Tawni's stolen song. Meanwhile, Nico and Grady try to find out how to work a magic box.
Sonny and her fellow cast members are all forced to attend a public high school after they run afoul of Dakota Condor again, and are fired from the show.
Because the casts of "So Random!" and "MacKenzie Falls" keep pulling pranks on each other, Ms. Bitterman decides do take them to the woods so they can start trusting each other. Ms. Bitterman tells the group about the legend of "Candyface" and when odd events start happening and personal items are found broken, the "So Random!" cast is convinced that "Candyface" is responsible.
It is Sonny and Chads 7th week aniversery and they are supposed to be going on a date. But Sonny is subsituting as Pauly but the man Hank doesn't come back to let her out.
meanwhile Nico and Grady try to convince Chad that Sonny isn't interested in him any more