Source: moviepilot.com

5. Young Avengers

You know how I said I wouldn't be including any official Avengers or X-men teams? Young Avengers is why I included the word "official".

The Young Avengers were a team of unsanctioned teenage superheroes, who were themed after the classic Avengers, but with a dark secret. The team was brought together by Iron Lad – secretly a young version of time-traveling Avengers foe Kang the Conqueror – who is trying to stop himself from turning into the villain he would one day become.

As the team fights crime and deals with personal strife, old-school Avengers threats like the Kree, and Kang himself, come a-knocking. Also, this is the series that gave us Kate Bishop, aka Hawkeye. And Kate kicks serious butt. Plus, Teddy (Hulkling) and Billy (Wiccan) are legit adorable together. So that's a major plus.

Young Avengers would be a great one-off film that would further expand the MCU, and in an interesting new direction. Plus, it would introduce Kang to the MCU. And Kang is goshdarn fantastic. Oh, and if the movie was based on the sequel series featuring America Chavez and Teen Loki, that would be MORE than acceptable.