When one of Nerdry's experiments goes wrong, Mantyz accidentally acquire heat energy so great that they become literally the world's hottest band. It's up to Freefonix to find a way to cool things down before Mantyz dominate the planet.
When Kurtz is granted exclusive knowledge of a rare Thirteenth Note riff that could give Mantyz unlimited powers, it's up to Freefonix to use all their cunning to decipher the riff before Mantyz can release Vox and Freewave is destroyed forever.
When Freefonix all have nightmares based on their fears, their Thirteenth Note powers begin to weaken. Vox sees this as a chance to escape the void by making Freefonix's nightmares come true: BB is near-invisible, Freez can't play his guitar, and Mo becomes tiny. Only a sound clash with Mantyz can restore the band to their former states.
Using a new invention from Nerdry, Mantyz manages to steal BB's voice and store it inside of ComaCo's main computer system. Vox has detected a weak spot in the void, centered in the computer, and wants to manipulate BB's voice to crack it open. With BB now silent and Nerdry unable to figure out how to use BB's voice, a new plan is hatched.
Everyone seems to have forgotten Mo's birthday, so he makes a wish. To Mo's delight, it comes true and Mo finds himself in an endlessly repeating birthday. But the sonic disturbance caused by the repeating day gives Vox the opportunity to escape. Freefonix must stop the repeating day and send Vox back to the void!
During a frantic soundclash, Freez breaks one of Misty's strings and is transported to a 13th Note dimension where he encounters the shapeshifting Kalano. Can BB and Mo return Freez before Kalano ensnares him in the lost dimension forever?
When the Polka Yodel craze sweeps into Los Bosmos, BB suspects that there is more to the Polka Meister and Yodeler than meets the eye. It turns out that she's right; this musical duo are actually master villains in disguise, and what's worse, they're actually CC and DD!
Freez believes Aw'right Jack is his long-lost father. When Aw'right Jack learns Freez may be his son, he becomes convinced he has musical talent and superpowers just like Freez. Meanwhile, Freefonix try to find a missing cell phone that has a Thirteenth Note ringtone and the power to free Vox.
Roborapper Flap, an old friend of Freez's, comes to Los Bosmos as the biggest rap star in the city. There is some bad blood between these two, something which is not helped when Sugar informs Freez that Flap is a potential Thirteenth Note guardian.
When musical genie Ozzy grants Kurtz three wishes, Kurtz idiotically wastes the first wish, but uses the second to make Mantyz the greatest band in history. As Los Bosmos is hit with "Mantyz-mania", Freefonix must find an ancient bootleg tape which is the only thing that will return Ozzy back to the amp.
Freez suspects that he and Misty are no longer (MLP) Musical Life Partners. Under the mistaken idea that if he loves Misty he should give her away to someone she loves in return, he gives her to the mysterious Carlos.
BB is horrified to learn that Mya has a contract obligating her to do one more song with BCD, but when the song goes titanium, success goes to BB's head - especially since she has finally won the admiration of Zera, who was the prettiest and most popular girl in BB's school.
In order to help his friend keep the oldest independent venue in Los Bosmos from falling into Mya's hands, Freez gets BB and Mo to agree to play a gig there. They soon discover that the venue is haunted by an entity which calls itself "The Phantom", who is dead against Freewave music being played in his home.
Mo becomes a phenomenon at Gloveball and his success threatens the future of Freefonix. But BB and Freez suspect ComaCo might be behind Mo playing at the Gloveball Championships.
When Mo's dad is promoted and he plans to move his family out of Los Bosmos, it looks like the end for Freefonix - but Mo plans to go out in style. Meanwhile, BB and Freez smell a rat: is Mo's dad's promotion on the level? They investigate and discover a sinister trail of deceit.
Mya uses a love potion and the dubious charms and talents of a wannabe singer named King Boy to break up Freefonix and bring BB under her control.
In a freak soundclash, BB and Lady Lux switch bodies. Now looking like BB, Lady Lux tries to steal Freez and Mo's instruments to help Vox harness the 13th note. Meanwhile, BB desperately tries to convince Freez and Mo that they're in jeopardy.
Freefonix is a British CGI animated television series about the adventures of fictional band of the same name. The series launched on 4 January 2008 and aired on children channel CBBC's on their daily segment on BBC One for thirteen weeks. The rest of the series, which consists of 40 x 24 minute episodes, along with the first thirteen, broadcast over the winter period on weekends on CBBC from 8 December 2008 into the January of 2009.