The Boys season 5 finale brought back the Sonic Whistle, an anti-Supe weapon first introduced in the spin-off series Gen V. This weapon, which emits a high-frequency sound harmful to Supes, was crucial during the climactic showdown between Billy Butcher's team and Homelander. The episode featured intense action sequences that addressed previous critiques of the season's low stakes. The Sonic Whistle's effectiveness was highlighted when it left the Supes vulnerable to attacks, demonstrating its potential as a game-changer in battles against superpowered beings. Despite its introduction in Gen V, the Sonic Whistle had not been utilized in The Boys until now, raising questions about its absence in earlier episodes. The narrative suggests that Vought may control all remaining Sonic Whistles, limiting the titular group's access to such an effective weapon. The writers' choice to withhold the Sonic Whistle from earlier conflicts appears to be a deliberate decision to maintain narrative tension, as its availability could have simplified the group's struggles against Supes.