Nintendo DS Ben 10: Alien Force

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From Wikipedia: 

Ben, Gwen and Kevin encounter the Forever Knights looking for a piece of alien tech at a pier. They also meet an off-world Tetramand Plumber named Gorvan, who is searching for illegal alien tech, and recruits them to help him.

The trio retrieves components from various places and defeating the Forever Knights and Pickaxe Aliens that were guarding them. Gorvan grows increasingly suspicious with each component collected, and the trio decide to keep an eye on him. Eventually, they learn from Max that Gorvan is a disgraced Plumber who was thrown out of the organization for hoarding and selling illegal alien tech. This prompts Kevin to hunt down Gorvan without backup, with Ben giving chase.

Kevin rushes into Gorvan's hideout, discovering that he has been hoarding alien technology at the behest of some customer. Gorvan releases Xenocytes, who attack Kevin. After catching up with Kevin, Ben finds him partially transformed into a DNAlien. Ben defeats Kevin and turns him back to normal, with the Omnitrix's DNA Repair function, sending him back to Gwen. Ben then finds and defeats Gorvan. He returns to Gwen and Kevin, and they discover that Gorvan was gathering components for a Highbreed, who proceeds to steal a component, and energy source, from them.

They track the Highbreed, who has used the components to build a Highbreed weather tower, which they intend to use to make Earth hospitable to them, in a process which would be fatal for humanity. The team is attacked by a swarm of DNAliens, forcing them to split up. While attempting to shut down the tower, ben accidentally activates it. Gwen and Kevin, however, succeed in disabling the tower's forcefields, allowing Ben to turn into Humongousaur, grow to maximum size and destroy the tower, causing the Highbreed's plan to fail.