Alec Baldwin and Kevin Spacey have signed on to lead the voice cast in DreamWorks Animation's Boss Baby, which was first announced back in June.

The story centers on a seven-year-old boy who becomes jealous of his infant brother, a fast-talking, briefcase-carrying baby (voiced by Alec Baldwin). The brother embarks on a mission to win back the love of his parents, when he discovers a secret plot hatched by the CEO of PuppyCo (voiced by Kevin Spacey), which centers on "this brash baby executive masquerading as his new brother." They must come together as true brothers and stop this evil plot to save their parents and the entire world.

Tom McGrath (Madagascar 3: Europe's Most Wanted, Penguins of Madagascar) is directing from a screenplay by Michael McCullers (Austin Powers: The Spy Who Shagged Me), based on the award-winning picture book by Maria Frazee. Ramsey Ann Naito (The SpongeBob SquarePants Movie) and Denise Nolan Cascino (Mr. Peabody and Sherman) are producing for DreamWorks Animation. 20th Century Fox is distributing, with a March 18, 2016 release date already in place.

Alec Baldwin previously lent his voice to DWA's Rise of the Guardians and Madagascar: Escape 2 Africa. He is currently filming Mission: Impossible 5. Boss Baby will be Kevin Spacey's first animated project since 1998's A Bug's Life. He will next be seen in the New Line comedy sequel Horrible Bosses 2.

Take a look at the first illustration of the title character below.