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Leonardo DiCaprio is heading to the small screen for a big development project with Showtime.

The movie star is attached as an exec producer to an untitled 1980’s drama exploring the mafia, by way of his Appian Way production company, along with “Ray Donovan” writer Brett Johnson who will exec produce and pen the series, Variety has confirmed.

The Brooklyn-set potential series follows a decade-long relationship between an unstable mafia captain and a rogue federal agent, each violating the strict codes of their respective organizations. The drama examines the power the Wall Street era had on the mafia and the FBI.

Johnson and DiCaprio will exec produce along with Appian Way’s Jennifer Davisson, Charles Pacheco, Jennifer Erwin, Dan Pearson and another “Ray Donovan” member Bryan Zuriff.

In the TV landscape, DiCaprio is getting busy. “The Wolf of Wall Street” Oscar nominee just optioned the rights to Simon Toyne’s novel “The Searcher” with Entertainment One and Appian Way. His shingle also inked a multi-year, first-look deal with Netflix for documentary and docu-series projects, which will focus on environmental and conservation themes.

DiCaprio is one of many big names working with Showtime on potential projects. Comedy about the 1970s L.A. comedy scene “I’m Dying Up Here” is being exec produced by Jim Carrey, while Common is an EP on a pilot created by Lena Waithe about urban Chicago.