First off, don't look down at this because it's animated. This film matches or beats the best live action films.
It's based on (and closely follows) the highly praised graphic novel of the same name. This series is credited with saving Batman from the 1960s TV series campyness.
It is in two parts, Watch both. One after the other.
It's been about 10 years since Batman has retired (the other heroes quit before him, except Superman who became a tool for national policy), Batman retired after the death of the second Robin Jason Todd. But Wayne (55 years old) is chaffing in his retirement.
A gang called 'the Mutants' has overrun Gotham which is having record levels of crime.
Jim Gordan is retiring in a few days.
It is set during the Reagan administration.
Of course Batman comes out of retirement.
He struggles with the physical exertions.
He takes on the leader of the Mutants and loses.
He gains a new Robin, a Girl Named Carrie Kelley.
He realizes that Batman is more than just physical abilities and goes after the Mutant leader again.
The Joker seeing the news reports of Batman's return goes on a killing spree forcing a showdown.
After the highly publicized battle, the government sends Superman to make Batman back down. Batman doesn't back down.
PS Batman cheats.
Epic quotes (from part one)
Batman shatters a thugs leg.
Cop: You just crippled that man!!!
Batman: He's young. He'll learn to walk again.
Batman (Fighting the Mutant Leader): You don't get it, boy. This isn't a mudhole... It's an operating table. And I'm the surgeon.
Batman breaks the Mutant leaders leg.
Batman (internal monologue): Something tells me to stop with the leg. I don't listen to it.
Overall, I give this film 5 of 5.