Led by Iron Man, Earth's Greatest Heroes, Hulk, Thor, Captain America, Black Widow, Hawkeye, and Falcon along with their new allies The Mane 6, The Royal Pony Sisters, Starlight Glimmer, and Sunset Shimmer combine their power battle threat no single hero can do alone, evil stands no chance.
Additional Tags: Princess Celestia, Princess Luna, Cozy Glow, Tierk, Chrysalis,
What series or movie is your story based on?
11388986
Avengers Assmble
I'm wondering though will other marvel super hero teams like the x-men, inhumans, eternsals and the fantastic 4 show up in this story?
11389945
Just wait and see
In your short description you say they "untie". IMO you mean "unite".