The art featured here was used during the creation of the animated shows, but are not the final animation cells. These pieces were purchased from Animation Legends.

Avengers Assemble

The series Avengers Assemble first aired in May 2013 and was meant to mirror the world of The Avengers[1]https://collider.com/marvels-avengers-assemble-jeph-loeb-steven-t-seagle-interview/, which had released the year prior.

Super Adaptoid: Season 1, Episode 6 – from the private collection of Grant B

Hulk’s Day Out: Season 1 Episode 14 – from the private collection of Grant B

Ghosts of the Past: Season 2. Episode 4 – from the private collection of Grant B

Next Avengers: Heroes of Tomorrow

The 2008 movie Next Avengers: Heroes of Tomorrow stars the children of the original Avengers. James Rogers is the son of Captain America and Black Widow, who carries on his parent’s legacies.

James Rogers with a look of shock on his face
James Rogers – from the private collection of Grant B
Francis Barton, son of Clint Barton, with James Rogers – from the private collection of Grant B

Ultimate Spider-Man

This series started in 2012 and featured appearances from many members of the expanded Marvel Universe. One of the recurring characters was Batroc the Leaper, who is a Captain America villain in the comics.

Batroc holding two purses while flipping over a woman.
Batroc leaping over a woman: Episode currently unidentified – from the private collection of Grant B

References

References
1 https://collider.com/marvels-avengers-assemble-jeph-loeb-steven-t-seagle-interview/