HBO still has the pull to bring in the biggest A-listers, as evidenced by one of Hollywood's biggest fish reportedly developing a project at the network.

Robert Downey Jr., Iron Man himself, will star in a potential new HBO drama, Variety reports. And he'll be doing it with one of HBO's biggest talents behind the camera, as True Detective creator Nic Pizzolatto is on board to write the series.

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There are very few details about the nature of the project, but Variety says the series would be a small-screen version of the Perry Mason reboot that Downey Jr. has tried to get made into a feature at Warner Bros. for several years. For those who aren't well versed in fictional lawyers, the character Perry Mason is a criminal defense lawyer who was the subject of many books, a radio show and most famously, the CBS series Perry Mason which starred Raymond Burr and ran from 1957 to 1966 and was brought back for 30 television films starting in 1985.

For Downey Jr., this would be his first return to television as a regular since appearing on Fox's Ally McBeal from 2000 to 2002. Downey Jr. has enjoyed massive box-office success, most recently as Tony Stark/Iron Man in the Marvel superhero films.

Pizzolatto earned fame after the breakout success of the first season of True Detective, with HBO securing him to a long-term deal for more projects. But Season 2 of True Detective wasn't nearly as praised, and a third season of the crime series has been up in the air.