The Marvel Cinematic Universe's mightiest heroes first assembled in 2012's The Avengers to battle Loki and the Chitauri. Three years later, they squared off with Ultron before reassembling for a universe-saving fight with Thanos and his Black Order. 

In Avengers: Doomsday and Avengers: Secret Wars, at least two new teams of heroes will do battle with Robert Downey Jr.'s Doctor Doom. Beyond that Latverian dictator, there are countless baddies from the comics who have yet to make their big screen debuts. 

Some of the characters listed here are relatively obscure and would be best served being supporting players; others, meanwhile, have the potential to take on a big bad role akin to the sinister foes mentioned above. It's all of them we're taking a closer look at today.

To find out which Marvel Comics villains we want to see in the Avengers franchise post-Secret Wars, click on the "Next"/"View List" buttons below.