I'm quite late on watching this one. But it was the misleading artwork on the cover. I always thought this was a kiddied-down version of the Avengers, like that awful Ultimate Spider-Man cartoon. While this is perfectly fine for children to watch, there's plenty here for comic fans to love. I really liked this one.
It's set in a dystopian future where Ultron rules the Earth and the Avengers and other super-heroes have been killed off. Only some of the Avengers' children have survived with an aging Tony Stark to watch over and hide them from Ultron. But they are eventually discovered after a returning, and damaged Vision arrives to their hideaway. Tony Stark dons the Iron Man armor one last time to defend them all, only to be captured. The children of the Avengers must follow in their parents' footseteps in order to rescue Tony Stark and take-down Ultron. New and old faces show up along the way. Nicely wrapped up with a rampaging Hulk.
Watch this one if you like animated comic features at all.