Nia DaCosta and Jack OConnell on that epic Bone Temple musical number

Critics are raving about Nia DaCosta's 28 Years Later: The Bone Temple, and a big part of why is the absolutely sensational climax, in which Ralph Fiennes channels his inner metal god to perform Iron Maiden's "The Number of the Beast" before an awed Jimmy Crystal (Jack O'Connell) and his remaining Fingers. 

Last year, O'Connell himself stunned audiences with a dizzying collision of horror and dance with Sinners, in which he played the singing, Irish-jigging vampire Remmick. With The Bone Temple...