Five Superheroes Standing by a Door

Five superheroes standing by a door,
One became a traffic cop, and then there were four.

Four superheroes watching over me.
One took home a lost boy, and then there were three.

Three superheroes dressed all in blue
One stopped a speeding car, and then there were two.

Two superheroes, --how fast they run!
One caught a bad man, and then there was one.

One superhero saw smoke far away.
He called the firehouse, and he saved the day.