: Unlike previous villains who tried to outrun Barry, The Thinker (Clifford DeVoe) used his superior intellect to trap the Flash in a specialized cell that nullified his speed.
: While technically S4E9, this finale features the iconic sequence of Max "running" from Vecna within her own mind, a scene that famously used practical dummies and real sets (like a winding staircase) augmented with digital effects to maintain realism. "The Flash" Don't Run (TV Episode 2017) - IMDb [S4E9] Run
: It features a rare moment of vulnerability for Barry, who tells Iris, " I don't have to run when I'm with you, " emphasizing his emotional reliance on her over his powers. Other Notable S4E9 "Run" Connections : Unlike previous villains who tried to outrun