Lieutenant Arex was an Edosian navigator who served aboard the USS Enterprise in 2269 and 2270.

When the Enterprise entered a negative universe in 2270, Arex began to grow younger, eventually becoming a child. His condition was reversed by Dr. McCoy using the ship's transporter.

(TAS: "The Counter-Clock Incident")

While under the influence of Harry Mudd's love potion, Arex sat at the navigator's station playing a lute, instead of attending to his duties.

(see large image left)

(TAS: "Mudd's Passion")

While the rest of the command crew was having a staff lunch, Arex was temporarily in command of the Enterprise. He later took his lunch break with M'Ress.

(TAS: "The Practical Joker")