What a transformation!David Harbourlooked nearly unrecognizable on the set of his upcoming HBO series,DTF: St. Louis. TheStranger Thingsactor, 50, appeared to have a heavier build, as well as salt-and-pepper hair and a moustache, in photos obtained byDaily Mailon Saturday, May 24. In one of the pictures, Harbour was wearing a fat suit. TheThunderboltsstar is no stranger to undergoing dramatic body changes. Ahead of filming season 4 ofStranger Things, Harbour lost a whopping 80 pounds for his character's storyline. 🎬SIGN UP for Parade's Daily newsletter to get the latest pop culture news & celebrity interviews delivered right to your inbox🎬 "I lost about 80 lbs. from season three — I was about 270 [then], and when we shot [season four] I was around 190," he toldBritish GQin an interview at the time. "I don't think I'll ever do that again," Harbour admitted. "I have this Santa Claus movie [Violent Night] coming out for Universal in December and I gained [it all back]. But now, yeah, never again. The prosthetics are too good." See photos of David Harbour here. Harbour has played Jim Hopper on the hit sci-fi show since it premiered in July 2016. With the fifth and final season set to drop some time in season 2025, Harbour has promised an emotional roller-coaster for fans. "The end of this episode when we were reading it—just us reading it—about halfway through, people started crying," Harbour recalled of the series finale in an interview withPeople. "Then about the last 20 minutes, it was just uncontrollably crying, waves of different people. NoahSchnappbeing my favorite." He added, "It's 10 years later, and we examine that idea, and it's so well done and so beautiful. It's such a great episode, and it's such a great season. You guys will love it." 'Stranger Things' Star Looks Unrecognizable on Set of New Seriesfirst appeared on Parade on May 25, 2025