A Cerritos ensign and leader of the Redshirts, a clique of command-hungry junior officers who try to remake Brad Boimler in their image in the Lower Decks episode The Spy Humongous.
Ensign Casey is a junior officer of the USS Cerritos who features in the second-season Lower Decks episode The Spy Humongous. He heads a small group of ensigns who call themselves the Redshirts and devote their off-duty hours to practising what they imagine captaincy to be: striking poses and rehearsing stirring speeches.
Impressed by Boimler's short spell aboard the Titan, Casey invites him to join, and the group sets about restyling him, pulling him away from Mariner, Tendi and Rutherford on the day they are assigned to collect dangerous anomalies from the senior officers' quarters.
When one of those anomalies turns Tendi into a rampaging scorpion-like monster, the Redshirts can only offer speeches. Boimler calms her by making a fool of himself until she laughs, which Casey regards as beneath a future captain. Boimler decides he prefers his friends and leaves the group.