2017 would see Downie appear in three feature films. First was the Netflix original "War Machine," a film which was inspired by US Army General Stanley McChrystal, opposite Brad Pitt. Second was a cameo in director Michael Bay's "", the fifth installment in the Transformers franchise. He would finish the year with Vertical Entertainment's hostage thriller "6 Days," which chronicled the siege of the Iranian Embassy in London by militants. The next year he would feature in independent film "The Mercy," the true story of Donald Crowhurst "(Colin Firth)", an amateur sailor who participated in the Sunday Times Golden Globe Race in 1968. He would go on to a supporting role in the comedy "I Love My Mum", from Spanish writer and director Albert Sciamma.