The designation most prominently refers to the fourth episode of the ninth season of the superhero series Smallville , which originally aired on October 16, 2009. Smallville Season 9, Episode 4: "Echo"
: Still reeling from his past actions and struggling with his identity as Green Arrow, Oliver faces a moral and physical breaking point during the hostage situation at the gala. [S9E4] Echo
While "Smallville" is the most direct match for that specific season and episode number, there are other relevant media titled : Watch Smallville Season 9 Episode 4 - Echo | HBO Max The designation most prominently refers to the fourth
: Winslow Schott (Toyman) resurfaces to take revenge on Oliver Queen. He disrupts a Queen Industries gala by planting a bomb and demanding that Oliver publicly confess to murdering Lex Luthor. He disrupts a Queen Industries gala by planting