Mitch Pileggi returned as Colonel Caldwell, who has not appeared in the series since season three's twelfth episode, "Echoes", due to Pileggi's commitments in The Batman animated series. He also appeared alongside Michael Beach, who last played Colonel Abe Ellis in "Lifeline".
Mitch Pileggi returned as Colonel Caldwell, a character he had not played since season three's episode "Echoes", due to his commitments in The Batman animated series. He also co-starred with Michael Beach, who last played Colonel Abe Ellis in another episode.