A young Enterprise ensign who mans the operations station during The Arsenal of Freedom, steadied by Geordi La Forge as he commands the ship in battle for the first time.
Ensign Lian T'su is a junior officer aboard the Enterprise in 2364. She appears in the first-season episode The Arsenal of Freedom.
With the senior officers stranded on Minos, La Forge is left in command when an invisible automated weapon attacks the ship. T'su is at ops with the equally inexperienced Ensign Solis at the conn, and both are visibly nervous as the shields weaken.
La Forge, under pressure himself and challenged by the chief engineer Logan, takes time to reassure them. After the saucer section is sent to safety, T'su serves on the battle bridge as he draws the weapon into the atmosphere of Minos, where turbulence gives it away, and destroys it.