Makoto is a young boy who gains superpowers due to an evil gene manipulation experiment. Makoto and other youths join the Avengers as apprentices named Future Avengers. Now Makoto and others will train, fight villains and grow, under Avengers members Iron Man, Captain America, Hulk, Thor, and Wasp.

Source: ANN

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Alternative setting: Disk Wars: Avengers
Alternative setting: Avengers Confidential: Black Widow & Punisher
Sequel: Marvel Future Avengers (2018)