Alongside Keough, the casting room was packed with hidden star power. The Six frontman Billy Dunne is played by Sam Claflin, while his brother Graham is brought to life by Will Harrison. Adding to the high-profile lineup is beloved English singer Suki Waterhouse playing the keyboardist Karen Sirko. The cast even went above and beyond by recording a real-life rock album called Aurora that is actively scaling global streaming charts. This blend of elite casting, retro fashion, and real-world music history creates a gossip-worthy phenomenon that fans will be returning to for decades.