Yawlis was a Starfleet admiral in the the 2290s.


In 2290, he briefed Captains James T. Kirk of the USS Enterprise-A and Hikaru Sulu of the USS Excelsior on a crisis. Yawlis told them that Tabuk 3 and 4, newly joined members of the Federation near the Romulan Neutral Zone, were disposing their massive stockpile of weapons of "frightening" mass destruction. He wanted Kirk and Sulu to let the Tabukans know that the Federation supports them and to let the Romulans know that they would not stand for any interference, hoping that the two ships would make it clear. (TOS - Tests of Courage comic: "Divide... and Conquer")