Wikimedia Commons/The Boys season 5 TV Homelander's greatest threat isn't The Boys-it's the fearless genius who put him in power. Sister Sage emerges as his ultimate rival in The Boys Season 5. April 3, 2026 AceShowbiz - The Boys season 5 is setting the stage for a dramatic power struggle where the most dangerous opponent for Homelander (played by Antony Starr) isn't the titular vigilante group, but rather a new player: Sister Sage.