Ben 10: Protector of Earth

Walkthrough
While sleeping near the Grand Canyon, a mosquito-like drone begins absorbing DNA from Ben's Omnitrix. Ben wakes up to see a large object crashing into the canyon, and drones are rampaging in the Grand Canyon. Strangely, Ben can only change into Fourarms and Heatblast. After fighting most of the robots, Ben fights a giant robot, and after defeating it, it expels a crystal (referred to as Omnitrix crystals); by absorbing it into the Omnitrix he is able to change into XLR8.

The Tennysons see that Vilgax's drones and the Forever Knights are fighting each other. After fighting the Forever Knights, one of them tells the Tennysons that Enoch is using technology from Area 51 to stop a dangerous threat. At Area 51, Ben fights Enoch, but he escapes with a giant robot made in his own image using technology from the base. The Tennysons track Enoch to the Hoover Dam and fight him and his robot. After defeating Enoch, his robot expels another crystal and Ben regains Cannonbolt from it.

While heading to San Fransico for a real vacation, Kevin 11 shows up from a Null Void portal on the Golden Gate Bridge and begins going on a rampage with Ben tracking him down. But Kevin brought some plant-like aliens with him (apparently from Wildvine's home world) and they begin joining the rampage as well. Kevin 11 kidnaps Grandpa Max, and Ben and Gwen track him to a lumber factory. After beating him, Kevin is sucked back into the Null Void. Meanwhile, the Tennysons now focus on fighting the plant monsters Kevin brought back with him tracking them to the top of the Seattle Space Needle. After beating the mother plant, it expels a third crystal and Ben regains Wildvine. Grandpa Max begins putting together clues taken from the past battles and realize that Vilgax is behind it all.

It is revealed that Zs'Skayr has freed Vilgax from the Null Void and has teamed up with him to get revenge on Ben. While camping at the Effigy Mounds, Ben and team are attacked by Ghostfreak's minions. While fighting them, they encounter Hex, who plans on taking over the Earth by opening a portal from earth to Ghostfreak's home world (the source of the minions) to create an army. After beating Hex, it is revealed that he was actually possessed by Ghostfreak. Ben tracks Ghostfreak to Chicago, where the latter reveals that he has used the crystals to supercharge three of his minions to fight Ben. After defeating Ghostfreak, Grandpa Max sends Ghostfreak to the Null Void. After the battle Gwen finds another crystal; it doesn't unlock any aliens but it does give Ben full power.

Ben tracks the rest of his alien DNA to another location, and while searching, the Tennysons are attacked by Dr. Animo's mutants. To make matters worse, Animo kidnaps Gwen. After tracking and defeating Clancy, they learn from him that Animo is planning on turning Gwen into a mutant, along with the rest of the world. Tracking Animo to an abandoned oil platform, where it is secluded and has sufficient power for his machines, Ben fights and defeats him and saves Gwen. They learn from Gwen that Animo partnered with Vilgax as well, and is planning to send the entire Earth into the Null Void with using the stolen Plumber Technology powered by alien DNA. After beating Animo, Ben gets the Master-Control.

The Tennysons go to Washington D.C. to warn the government of Vilgax's plan; meanwhile, Null Void portals are opening everywhere. However, the government cannot respond, so the Tennysons go to Cape Canaveral to get to Vilgax's ship via space. After defeating Sixsix, Ben goes to fight Vilgax while Gwen and Max focus on trying to stop Vilgax's plan. Vilgax is defeated and sent into the Null Void along with his ship, but not before the Tennysons can escape and take back the rest of Ben's alien DNA.

As Vilgax is repaired by his nanobots in the Null Void, he swears that he will return someday. The last area is the Null Void where Ben fights all of his enemies again. In the final scene, Gwen tells Ben how impressed she is as, while Max looks for a way out of the Null Void.

Playable Characters

 * Ben Tennyson
 * Four Arms
 * Heatblast
 * XLR8 (Defeat Mega Drone)
 * Cannonbolt (Defeat Enoch's Robot)
 * Wildvine (Defeat Snap Dragon)
 * Upchuck (DS only with a cheat)
 * Gwen (DS only with a cheat)

Bosses

 * Enoch (Mini-Boss)
 * Enoch Battle Bot
 * Kevin 11 (Mini-Boss)
 * Hex (Mini-Boss)
 * Clancy (Mini-Boss)
 * SixSix (Mini-Boss)
 * Giant Vilgax Destroyer
 * Armortron Crusader
 * Snap Dragon
 * Ghostfreak
 * Dr. Animo
 * Vilgax

Levels

 * Grand Canyon
 * Mesa Verde
 * Area 51
 * Hoover Dam
 * San Francisco
 * Redwood Forest
 * Crater Lake
 * Seattle
 * Effigy Mounds
 * Plumber Base
 * Chicago Lake Front
 * Gold Coast Theater
 * Historic Battlefield
 * Bayou
 * New Orleans
 * Oil Refinery
 * Washington D.C.
 * Cape Canaveral
 * The Merciles