At first glance, The War With Grandpa sounds like a bad spinoff of Dirty Grandpa or Bad Grandpa. Funny enough, it will feature Robert De Niro, who starred with Zac Efron in the former. But it’s not, and perhaps this comedy affair will rise from the muck of mediocrity with additional cast members Christopher Walken and Eugene Levy.

Deadline was the first to report the news of this trio’s casting, which marks a reunion with De Niro and Walken. The paired worked together on 1978’s The Deer Hunter, the five-time Oscar-winning film from writer-director Michael Cimino, who passed away earlier this year. Walken walked away with a statuette for Best Supporting Actor, while De Niro was nominated for Best Actor.

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Image via Relativity/EuropaCorp

I don’t know what it says about them that their next collaboration would end up being something called The War With Grandpa, which is directed by Tim Hill, the man behind Grumpy Cat's Worst Christmas Ever and Alvin and the Chipmunks. But, hey, even A-list Oscar winners gotta eat.

The story is based on a children’s book by Robert Kimmel Smith about a boy named Peter who isn’t thrilled that he has to share his room with his grandpa when he comes to live with his family after his wife dies. The boy tries to kick him out with a series of pranks, but his gramps is just as inventive. Obviously, it’ll have a happy ending considering the source material. De Niro will play the grandfather, while Walken plays his best friend. The cast also includes Laura Marano, Max Jenkins (as Peter), and Lydia Styslinger.

There are four names credited on the screenplay: Lisa Addario and Joe Syracuse, and Matt Ember and Tom Astle, who worked on the rewrites. The film is already set for release on April 21, 2017.

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Image via EuropaCorp