John Corben is being questioned during Lillian Luthor's trial when he attacks the courtroom using his Metallo abilities in episode 2x12 "Luthors".
Lillian takes Lena to one of Lex's hidden lairs to retrieve some anti-alien weapons from an armory in episode 2x12 "Luthors".
Ben Lockwood holds a rally to announce his racist policy and a peaceful pro-alien march converges on the event in episode 4x14 "Stand and Deliver".
Kovaks takes Elliot with him to interrogate Sergei Brevlov who financed Isaac's cloning operation in episode 1x06 "Man with My Face".
Elliot enters the facility disguised as a general while Kovaks hides in his car's trunk in episode 1x09 "Rage in Heaven".