When Sparks Fly is a Marvel Versus HB 2: New Age of Heroes episode.
- Ash, Tooty, Amy and Fox arrive at Gringy City one night and discover that all the Pokemon have been sick even Pikachu. When it was taken to Suzy's hospital, they enter the power plant. Many Grimer are draining the power. Meanwhile, Cyclops, Spiderman, Rogue and Captain America have to go to the other side. Meanwhile, Magneto, Storm and Sentinel have to take the sewers. Later, the Grimer burst into the plant with the leader, a Muk, as well. They give the four HB fighters a big chase. While running away, they bump into the four Marvel fighters and they all race into the control room. Ash explains that the Grimer are draining energy. When a bunch of them burst in. Ash puts on his Ryu outfit, Tooty puts on his Flash Elephant outfit, Amy puts on her Sailor Mercury outfit and Fox puts on his Green Hornet outfit. Then they save the power plant and the power has been stored. Later, the fighters make their way home at the end of the episode. Note: The music when Ash and the others are running away from a bunch of Grimer is Mr. Patch's Theme from Banjo Tooie.
- Ash Ketchum
- Amy Mizuno
- Fox McCloud
- Captain America