Max tells them that he was only thinking about taking Phoebe's powers but she actually took his powers. The voice says that Phoebe has been selected for a chance to join the last spot on the Z-Force because of defeating one of the world's biggest supervillains,. Nora asks Billy for help but Billy goes to hide, claiming that he is no superhero. Link tries to stop Max but Max freezes him and throws him away telekinetically. The Z-Force is an elite team of superheroes under the which accepts only the best superheroes.
Nora wishes she could be her sidekick while Billy wishes he could be her boyfriend. He falls on the floor close to a table. Barb suggests using the Thunder signal but they need more light to make it more noticeable in the sky. Back at the Thundermans house, the Thundermans congratulate Phoebe for thwarting the diamond robbery and making it on the news. Therefore they use heat breath and freeze breath at the same time, causing the machine to start acting up, ready to explode. Colosso loves the idea hoping that he will get something big out of it.
This gives Phoebe an idea: since none of them have dates, they could all go to prom together. On the day of the prom, Allison finds Phoebe in the hallway again and asks her why Max hasn't called yet. Max asks him to do it the following week because he has to hangout with Allison, but Dark Mayhem refuses angrily. Meanwhile, is setting up for their prom performance. President Kickbutt reveals that she only pretended to take away their powers to keep it a secret once again and avoid all the attention, which was leading to unfortunate circumstances. This is revisited in multiple other episodes in season 4 including. Kickbutt says he won't need his weapon inventions anymore but Max proves that he could use them on villains too.
One can only have one best friend. Phoebe promises to tell Max to call. Phoebe and Max take their prom picture together along with their prom dates and their friends. Colosso even refuses to accept Max's goodbye. However, when a new threat arises in Hiddenville, Max and Phoebe risk losing everything including their powers to go back and save their friends and the city. He eventually defeats the Son of Scalestro by indirectly hitting a pillar, which reflects the electrical energy to hit him. Phoebe asks her friends to take a break and notices and goes to ask her out for prom.
He notices Sparkles from the Hero League trying to take away his stuff. Dark Mayhem reveals that he doesn't want to destroy Hiddenville. Max tries to grab it back but as they fight for the orb, Phoebe accidentally takes away Max's powers. Max agrees to let Phoebe train her. Max then notices the orb and pulls it with telekinesis. Cherry accuses Phoebe for being a backstabber. However, Max's mind is off because he's worried that Phoebe is getting all the recognition as a superhero while he hasn't achieved anything.
Lucky for them, Dark Mayhem sees some writing on the kitchen counter showing that it's prom night. The Thunder Twins ask Dr. She's also mad that and were so busy showing off their powers to the neighbors that they didn't pay attention to what was happening. The Hiddenville residents and reporters walk away because the Thundermans are no longer special in anyway. So, President Kickbutt gathers Hiddenville's residents and announces that she is going to take away the Thundermans powers.
And she is going to pay for it. He just wants to enslave everyone in it to build his new evil empire. He walks to the stage, takes the microphone and announces that Phoebe Thunderman is ThunderGirl. Phoebe drops her bag on the floor to hug Link, exposing her ThunderGirl supersuit. Principal Bradford comes over to Max and starts making demands on what Max should do for him in order to graduate. He is about to take them, but Barb begs Max to give them back their powers because Dark Mayhem is about to destroy them all. He says he would do the job himself if he knew where ThunderGirl lived.
The Thundermans are forced to live in the snow. However, Max convinces Phoebe that it's worth it because he would never forgive himself if something was really wrong. Lady Web uses her powers to drop a chandelier on , and but Phoebe uses her to save them. He tells Phoebe it feels so good to finally be able to do that in public. There's no one in the lair. But it's already too late.
Phoebe remembers that Link is still frozen. Nora comments that Chloe looks super cute, but Chloe states she's a villain's worst nightmare. And he just knows the right man for the job: her brother, Max Thunderman. Chloe has already told the parents that she teleported the twins back to Hiddenville. The customer insists on getting an extra pickle. Meanwhile, Barb goes after Strongdor who tries to hit her with his huge hammer.
Kickbutt agrees to let Max keep his weapons because she likes it when villains suffer. Max wants to use his while Phoebe wants to use. She suggests Allison could find another date. With no other option, Nora and Billy run away and leave their fans fighting. On arrival, Phoebe and Max find that Candi has thrown a huge party at the house. Following Candi's defeat, her hypnotized victims regain their consciousness and are clueless of what happened to them. Phoebe and Max think fast and turn the minions against each other by telling them they can't all be Candi's best friends.