Via space elevtor, Sonic and Tails arrive at the central hub for Eggman's Amazing Interstellar Amusement Park. Both are fond of the place, but Sonic suspects it's a front for Eggman's latest scheme. Before the two can do anything substantial, Sonic intervenes in the pursuit of two small aliens running from Eggman's cronies, Orbot and Cubot. For further defense, one of the aliens hijacks Sonic's body for an attack.

Later, Tails works on creating a translator for the sake of understanding the second alien. Sonic eventually returns and relays to an unbelieving Tails what the aliens can actually do. As the alien unsuccessfully tries to chime in, Sonic relays that they need to stop Eggman and rushes off to find him counting the few aliens he's kidnapped while berating his assistants. After the robots painfully dissect Sonic's joke, Eggman sics ferris wheel boss Big Boy on the hedgehog; Said hedgehog proceeds to destroy it.

Orbot and Cubot are charged with picking up Big Boy's dismembered remains which Cubot notes is a rather gruesome job. Orbot briefly notes they're missing an arm but is convinced not to worry about it. Out of sight, the arm has ended up inside of piece of machinery central to the hub.

Meanwhile, after Sonic comes back, he finds that Tails has gotten the translator working to some degree. After wading through nonsense, they manage to discover that the alien's name is Yacker and that he's part of a race called Wisps. Eggman is harvesting the Wisps for their energy, so Yacker pleads for help. Sonic recalls having seen a map for the rest of the park and advises they go check it out.

In Sweet Mountain, Sonic runs across a candy pirate whom is guarding a strange generator. He destroys both pirate and generated before Tails and Yacker show up. After painfully showing off, Sonic asks Tails for more info. It's reiterated that Eggman, whom the Wisps call "Baldy Nosehair"-- much to Sonic's delight-- is using the energy for an "evil purpose." Afterwards, Sonic heads off to Starlight Carnival.

Another generator down, Sonic and Tails happen onto Eggman who aims a beam at Sonic, but Tails takes the hit, falling under Eggman's control. Before a fight between friends can break out, the energy runs out. After the setback, Eggman finally describes his plot-- All of the Wisps' energy will be harvested to fuel a mind-control beam that will force the universe into worshipping him. He leaves another boss, or rather "tour guide", to deal with the two but Sonic inevitably destroys it.

Tails has now managed to gather another translation: The energy residing inside the Wisps is called Hyper-Go-On. It's their life-force and the reason why Sonic can the Wisps can combine. Also, there are five generators, leaving three left to destroy. During this exchange, Eggman and Orbot try to fix Cubot's voice chip, but manage to give him a pirate accent instead. Orbot notes it's exotic while Eggman merely orders him to fix the chip before proceeding to gloat.

Sonic and Tails continue to travel across the park and destroy the generators. Upon reaching Asteroid Coaster, Sonic discovers Eggman's underground conversion unit that is turning the Wisps into Nega Wisps-- purple, eye-less, destructive monsters. This, along with the planet's generator and its guard are destroyed, and Sonic returns to the main hub with Tails to celebrate.

Eggman, displeased over the planets' freedom, tries to fire his mind-control weapon regardless. But the misplaced arm lodged in the machine causes it to explode and destroy the hub. Sonic and Tails flee to the space elevator, but are stopped by Eggman in his "Egg Nega Wisp", a machine that has the ability to use every Wisp power Sonic can, sometimes in combinations. After a comedic exchange over Eggman's puns, Sonic forces Tails into the elevator and proceeds to duel.

Despite Sonic's victory, the energy released in the prior explosion reforms into a black hole. He continues running down the space elevator, but is engulfed in the void. The Wisps are able to enter the black hole and rescue Sonic, reuniting him with Tails on Earth before putting a stop to the ensuing disaster. Yacker finally reunites with them, and Tails is finally able to perfectly translate Yacker's graciousness and good-bye. Despite this ironic setback, they wish the Wisps off and stand satisfied at a job well done.

Eggman has also managed to survive the disaster, but is out in space. Orbot and Cubot are pushing him along to wherever his latest scheme lays. But the whole way there, Cubot talks it up, happy that his original, far-more-annoying voice has returned.

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• 1; NP cover courtesy of SykoTech
  
• 2; NP scans courtesy of Hero of Legend
  
• 3; Famitsu scan courtesy of Hero of Legend
  
• 4; ONM scans courtesy of Stasis Colours
  
• 5; Nintendo Acción scans courtesy of SonicParadise.net
  
• 6; Dengeki DS Manga scanlations courtesy of Marcello F
  
• 7; NP Preview courtesy of Nintendo Power.com
  
• 8; Sonic Running Image courtesy of TSSZ News
  
• 9; JP logo courtesy of HunterTSF
  
• 10; NP cover render courtesy of Hero of Legend
  
• 11, 12; Wisp Powers and Animated Wisps courtesy of TSSZNews
  
• 13; Level Assets courtesy of Woun
  

All other images courtesy of the official Sega America Blog, Sonic City Blognik, and SEGA Press Vault