A Ragtag Bunch of Misfits
is pulled together on emergency to fulfill some grand goal
. They succeed.
And then realize that they are quite good at working with each other and can stay a team for the future crises to come.
- In Justice League, J'onn calls upon six other superheroes and heroines to defend Earth against the Imperium, but when the enemy is defeated, they decide to make the arrangement permanent, since they work well together.