Zac Efron and Russell Crowe are currently in negotiations to star in ‘Green Book’ filmmaker Peter Farrelly’s ‘The Greatest Beer Run Ever’ at Apple Studios.

The casting bods on the project are also eyeing Bill Murray for a supporting role.

The film tells the story of Chick Donahue, who left New York in 1967 to bring beer to his childhood buddies in the Army — while they are fighting in Vietnam. Donohue took a good idea to the extreme, hitching a ride on a Merchant Marine ship, then carrying the beer through the jungle as he tried to track down his three friends. Dressed in shorts and Hawaiian shirts, he was mistaken for CIA, which made his effort a bit easier.

Efron would take on the lead role of Donahue.

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Developed by Farrelly, he co-wrote the script alongside Brian Currie and Pete Jones It is based on the bestselling book ‘The Greatest Beer Run Ever: A Memoir of Friendship, Loyalty and War’ by Chick Donahue and J.T. Molloy.

Andrew Muscato and Skydance’s David Ellison, Dana Goldberg and Don Granger will produce. Production is scheduled to begin in August.