Miley, Lilly, and Oliver start their first day of High School at Seaview High School. Miley receives a message that someone knows she has a secret. She learns that Rico sent her the message and is afraid he knows that she is Hannah Montana.
Lilly gets picked to be a team captain for flag football in gym class and doesn't pick Miley. Miley refuses to speak to Lilly. When Miley learns that she has won a country music award, she has no one to tell but Oliver. Oliver handcuffs her and Lilly together until the agree to be friends again. Unfortunately, he loses the key.
Miley tells Lilly that she thinks Lilly needs to act more like a girl now that they are in 9th grade. When Matt asks Lilly to the dance, she tells Miley she wants to be turned from "skate chick to date chick." Unfortunately, Matt liked the old Lilly better. Meanwhile, Jackson has to decide who he is taking to the big game.
Robbie tells Miley she can't go on a European tour as Hannah Montana unless she gets good grades in science. Miley creates a song and dance to help her ace the exam. Meanwhile, Jackson volunteers to take care of Thor's pet, but he causes Jackson trouble.
Miley overdoes it by singing six encores as Hannah Montana and loses her voice. She tries vocal rest, but it only helps temporarily. She learns she must undergo surgery. While sleeping, her late mother visits her in a dream and tells her that everything will be okay.
Fighting over sharing a bathroom gets Miley and Jackson grounded on the night of a big party. They convince Oliver and Lilly to disguise themselves as Miley and Jackson to fool Robbie.
Lilly gets a new boyfriend. At first Miley is thrilled, but then she stars to feel like the third wheel when Lucas takes up all of Lilly's time. Then Miley sees Lucas kissing another girl at school. Miley tells Lilly, but Lilly doesn't believe her, so Miley makes it her mission to try to prove that Lucas is a cheater. Meanwhile, Rico becomes obsessed with security when he gets robbed.
When Miley's date is ruined by Roxy's overbearing nature, Miley is furious. After meeting the President of the United States, Miley suggests that Roxy go and work for him. Meanwhile, Jackson pretends to be a professional motocross racer to impress a girl.
Jake Ryan comes back home to Malibu from Romania and wants to restart his relationship with Miley. However Miley refuses to forgive him. While on the red carpet with his co-star Marissa, he accidentally calls her Miley.
Now that Miley has told Jake her secret, Jake gets a wig and tries to be a "normal kid." Unfortunately, this brings out the worst in him and Miley wants to break up. But she is afraid that if she dumps him, he'll tell her secret. So Miley decides to act crazy at his movie premiere in order to get him to dump her.
Robbie writes a song for Miley. She finds a copy of it in his pocket and she hates it. She decides not tell him, but then starts sleepwalking. When she sleepwalks, she tells the truth. Afraid of what she might say, her brother and friends try to cover for her.
Jesse McCartney comes backstage after a Hannah Montana show and asks if she'll go out with him. Unfortunately, Miley has a science project due at school and has to turn him down. That night, Miley wishes upon a shooting star that she could be Hannah all the time and not have to lead a double life. Her wish comes true and her life is turned upside down.
Hannah/Miley meets one-hit pop singer Mikayla on a talk show promoting the show they are doing together in Florida. Although Hannah is inititally polite, the two become fast enemies. Miley plans to make sure that "Hannah" gives a stunning performance in Florida, but when Robbie hurts his back, her chances of going are jeopardized.
Oliver is jealous that Lilly gets to be backstage for all Hannah Montana concerts. Miley invites him, which makes Lilly jealous. Miley realizes she is in a lose-lose situation when she gets an extra ticket to a celebrity tennis tournament. Lilly and Oliver battle for the ticxket, and continue to battle for Miley's friendship.
Lilly records a song for her mother, but it doesn't turn out good. Miley decides to step in and make it sound better, without telling Lilly. When Lilly hears it, she comes to believe that she is a great singer and agrees to compete against Amber in Karaoke Night at school.
Miley gets jealous when her Dad spends time jamming with The Jonas Brothers. Meanwhile, Jackson tries to break the World Pogo-stick record.
Miley wants to get a new phone but Robby won't let her. Miley sells an embarrassing picture of Hannah to a tabloid to get the money but discovers that she was wearing a necklace with "MILEY" on it. To get the picture back, Miley tries to exchange it for an embarrassing picture of Dwayne “The Rock” Johnson. Menwhile, Jackson gets a sunburn from a volleyball game and doesn't want Robbie to find out.
Jake tells Miley he wants to keep their relationship platonic. Miley is fine with that, until she finds out that Jake is doing a movie where he has to kiss her enemy Mikayla. Meanwhile, Rico makes a bet that causes Oliver and Jackson to appreciate cleanliness more than ever.
Miley and Lilly are thrilled when Robbie goes on a date with Lilly's Mom. But when things don't go as planned, Miley and Lilly fight over who's at fault. Meanwhile, Jackson and Rico pretend to be each other.
Miley wins the Female Artist of the Year award. Then, Aunt Dolly And Mamaw drag an unwilling Miley into their long time feud.
Jackson accidentally rips Miley's stuffed bear apart. Upset, Miley tries to get back at him by ruining his Joey Vitalo-signed baseball. She decides not to ruin it after all, but ends up accidentally destroying it anyway. She tries to get it signed again, but Joey won't sign it unless Hannah Montana comes and performs for him.
Miley's Uncle Earl comes to town and wants Miley to help him become a rock star.
Robbie takes Miley and Jackson to a cafe that has special meaning to him, but they don't share his love for reminiscing. Oliver and Lilly find themselves in a sticky situation.
Robbie is upset when Miley and Jackson forget his 40th birthday, especially since he assumed they would make a big deal out of it. Meanwhile, Oliver and Lilly hope to make some money when they find a unique potato chip.