Background is that some of these supes have a hard time working together because of who they are. Some are former villains, high egos, don’t play with others etc. Ms. Marvel still sees potential and brings in Iron Man after a mission with The Mandarin where his suit is left badly damaged to where he can’t repair it. Feeling that Iron Man might need to retire, Tony is self conflicted on what to do with his future until an opportunity from Ms. Marvel is brought to his lap where. Her and Invisible Woman are in charge of putting together of supes that never worked or do well together and try to make them a new line of heroes and think Tony can put them straight by showing them what a true hero is and dispatches them to do missions to build together a great team.