Seasons & episodes

Annie becomes obsessed by her work at the plant. An experiment she is conducting with her good-looking lab partner drives Alex out of their room and into the wood shed. Annie's partner betrays her, and she realizes that she's been a selfish sister to Alex.

Louis makes a great effort to impress his old friend, Spivey, including throwing a party at the donut shop which jeopardizes Alex's job. The boys have to learn that friendship involves more than first impressions.

Alex discovers that corruption is rampant in the town's "Woman of the Year" contest. When she tries an experiment on Louis, Alex gets yet another dose of havoc-inducing chemicals.

Alex has to decide how to handle the attention of a seventh-grade admirer. Vince sneaks into the Macks' house to spy on George's research and gets stuck in the basement.

Math is the ultimate challenge for Alex, and when she starts cheating, she can't stop. For help, she turns to Annie, who steers her back to her senses. However, Dave has been spying on Alex and has begun to question some floating exam books and other mysterious phenomena.

Alex befriends an unpopular guy and finds that her own friends turn on her. She blames them until she realizes the unpopular guy has a thing for her. Ray has an unlikely adventure when Dave helps him pass a driving test.

There is only one problem with Alex's new boyfriend: he's also dating Annie. In what turns out to be an innocent set of circumstances, Alex must walk away from a guy with real potential. Annie's broken heart is made worse by the fact that Barbara is following her around for a science experiment.

Alex's old friends don't like her new friend, and with good reason: The plant has hired the new girl as a spy at the school, and Lars now suspects George is a mole.

While out racing bikes in the woods, Ray and Alex find a recluse who lives in a treehouse. He turns out to be one of the original GC-161 scientists. Vince and Lars learn of the existence of the scientist and Alex, Annie and Ray rescue him from the plant's goons.

A school bully picks on Alex and she must summon all her powers to resolve the ensuing conflicts. Meanwhile, at the plant, George is suspected of espionage when Annie accidentally leaks GC-161 information to Lars.

In a surprising move, Alex tries out for cheerleading...and makes the team! But while she enjoys her new popularity, she misses her carefree life. Louis accidentally switches diskettes with Annie so that she narrowly escapes getting in trouble with the evil Danielle Atron.

Alex gets a job with Louis at his dad's distributing company so she can buy her own car.

When Robyn joins an environmental group the donut shop is threatened and Alex's friendship with Gloria is tested.

Junior camp counselor is a new role for Alex, and one for which she's not well-suited. She and Kelly get lost in the woods, are chased by a bear and learn the importance of two words: friendship and rescue. George remembers his own camp experiences with mixed emotions.

Aunt Ashley is everything Barbara isn't: fancy, outrageous, irresponsible, crazy. Alex's wild go-cart ride with her aunt forces Barbara to get tough with both of them. Alex's school work suffers while her spirits soar.

Alex tries to rescue a chimp named Oscar from Vince by secretly keeping him as a pet. Annie is forced to tell George the truth about GC-161.

While Louis is innocently taking a photo, he catches Alex's zapper-gone-wild on film. He's sure he's captured some kind of UFO that will make his footage famous. Meanwhile, Alex helps George overcome his fear of bowling.

A morphing accident causes Alex to switch bodies with Barbara. Alex realizes that she's not ready for adulthood. Annie loses confidence about leaving home and talks to George about it.

When Alex and Annie are stuck at home during a rainstorm, they reminisce about the value of superpowers and sisterhood.

Alex saves a woman's life but can't tell the authorities that she double-morphed the woman to the hospital. The mystery heightens Danielle Atron's suspicions. As Annie prepares for college, a bittersweet realization comes over the sisters who share so much.

Alex struggles in Spanish class with a tough teacher, then struggles with the possibility that she got the teacher fired. Lars sets Dave up to be the first human research specimen for dangerous GC-161.

Alex has a doctor's appointment and fears her altered body chemistry will be discovered. Robyn grieves over the loss of her hamster.

Ray, Louis and Alex form a band and have to deal with issues of leadership, fame and competition. Robyn learns the ""rules"" of dating from Kelly.

Ray is purposely mysterious about his new girlfriend, Rachel, so that Alex won't get jealous. Alex becomes jealous anyway and struggles with accepting a new friend.