Warner Bros. has just released its first “official trailer”, as opposed to the teaser (which is funny but offers no clue to the movie’s plot), for its forthcoming CGI animated feature, Storks, due September 23, 2016; directed by Nicholas Stoller and Doug Sweetland, with the voices of Andy Samberg, Kelsey Grammer, Keegan-Michael Key and more. The story begins to be revealed.

Storks used to deliver babies. They are famous for delivering babies. But this image is obsolete. They modernized some years ago, and now specialize in delivering commercial packages for giant Cornerstore.com; a competitor to FedEx, on a worldwide scale. Junior, the top delivery stork, is about to be promoted upstairs into the executive ranks when he accidentally activates the old Baby Making Machine and produces an adorable baby human girl.

Desperate to get rid of the baby before his goof is discovered, Junior and his assistant Tulip, the only human (female) on Stork Mountain, find a human boy who has wished that he had a younger brother. They try to persuade him to take a baby sister instead. And what must the hapless parents think of this?

We’ll find out in September.