John Slattery is looking back on his Mad Men days.

The actor, 63, recalled “briefly” crossing paths with his Mad Men costar Colin Hanks while speaking with PEOPLE about their movie Nuremberg.

The 2025 drama reunites Slattery with Hanks, 48, who starred in three episodes of the Jon Hamm-led television series as Father Gill in season 2.

Slattery played Roger Sterling in Mad Men for all seven seasons from 2007 to 2015, and also directed three episodes. The actor didn’t interact with Hanks in the series, but he told PEOPLE that they crossed paths on set.

“We did [meet] briefly back then,” Slattery said. “I didn’t have anything to do with him story-wise on the show, but we had met and chatted.”

The actor then noted that Hanks is a “great guy” and they spent “a lot” of time together while filming Nuremberg.

The movie, directed by James Vanderbilt, follows U.S. Army psychiatrist Douglas Kelley (Rami Malek) as he is assigned to analyze the mental state of Adolf Hitler’s second-in-command, Hermann Göring (Russell Crowe), and other Nazi officials in the aftermath of the Holocaust.

Slattery plays U.S. Colonel Andrus, who ultimately brings in Hanks’ Gustave Gilbert, a psychologist, to offer a second opinion on Kelley’s work.

The drama movie, based on the nonfiction book The Nazi and the Psychiatrist by Jack El-Hai, also stars Michael Shannon, Leo Woodall and Richard E. Grant.

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Slattery said he was initially drawn to the movie by its starry cast, and then read Vanderbilt’s script and the nonfiction book that the real-life Burton C. Andrus wrote.

“It’s a great story to be involved with and had great people to work with. [Vanderbilt] had the money to produce it with some size and some scale, which doesn’t happen a lot,” he said. “They don’t make movies like this anymore at this price point.”

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When it came to bonding with his costars, Slattery said, “It was a great group of people. We all got along well. Michael Shannon is a very funny guy. I’ve known Rami [Malek] for a while. We had a good time. It was grave during the day and it was heavy, but it was easy to let off steam after.”

Slattery shared that the cast “all lived in the same hotel” and would hang out after shooting. “I think we felt like the material was good and it was worth everybody’s time. So we had a really good time,” he told PEOPLE