During the mid-2260s, Kyle served aboard the USS Enterprise under Captain James T. Kirk. He served primarily as transporter chief, but also functioned as an engineering assistant, and relief helmsman. He was also trained to operate the science station.

In 2267, Kyle was on duty as transporter chief after the Enterprise was accidentally thrown back into Earth's 20th century. He was in the transporter room when John Christopher entered, pointed a phaser at him, and demanded to be beamed back to Earth. Christopher was immobilized by Kirk before he could carry out his threat.

Kyle later stood by in the transporter room while Kirk and Sulu beamed down to the airbase to retrieve the US military's data on the Enterprise. After inadvertently beaming up an Air Police sergeant, Kyle was given the duty of watching the officer. After beaming down a second landing party, Kyle asked the sergeant if he was hungry, and got him some chicken soup from the food slot.

Kyle was also on duty in the transporter room when he was approached by Marla McGivers, who pointed a phaser at him and told him to move away from the transporter console. Then as he moved away, Khan Noonien Singh came up from behind and incapacitated him. He was later incapacitated by Dr. Leonard McCoy after the delusional McCoy received an accidental overdose of cordrazine. Kyle was also manning the transporter when Kirk, McCoy, Scott, and Uhura were beamed up in the middle of an ion storm. His mirror universe counterpart was also at the controls.

His Later Career

In the 2280s, Kyle was promoted to the rank of commander and was assigned as the communications officer aboard the USS Reliant, under Captain Clark Terrell.

In 2285, Kyle was stranded on the surface of Ceti Alpha V when Khan Noonien Singh commandeered the Reliant. He and the rest of the Reliant crew were later saved by the USS Enterprise following the latter ship's escape from the Mutara Nebula.
(see the movie Star Trek II: The Wrath of Khan)