Keel is a Capellan warrior and follower of Maab in Friday's Child who backs his leader's seizure of power and later kills the Klingon agent Kras with a thrown kligat.
Keel is one of the warriors of the Ten Tribes of Capella IV in the Original Series episode Friday's Child. He is a close supporter of Maab, the ambitious rival of the High Teer Akaar, and sides with him when Maab overthrows and kills Akaar with the encouragement of the Klingon Kras.
Keel takes part in the pursuit of Kirk, Spock, McCoy and Akaar's pregnant widow Eleen when they flee into the hills. Like the other Capellans he fights with sword and the kligat, a three-bladed throwing weapon.
When Kras turns a stolen phaser on the Capellans themselves, Maab offers his own life to draw the Klingon into the open. Kras shoots Maab, and Keel at once kills him with a kligat. Keel is then among those who accept Eleen's newborn son as the new Teer.