The officer in charge of Earth Outpost 4 on the Romulan Neutral Zone in 2266, who reports the destruction of neighbouring outposts before his own is annihilated.
Commander Hansen appears in the first-season episode Balance of Terror. His outpost is one of a chain built into asteroids along the Neutral Zone, set up after the Earth-Romulan War a century earlier.
When the Enterprise answers his distress call, Hansen appears on the viewscreen in the wreckage of his command centre. He reports that several outposts have been wiped out by an unknown weapon, and that his own, buried deep in solid iron and shielded, has been crippled by a single hit from a ship that then vanished.
While he is still speaking the attacker reappears and fires again. Kirk and the bridge crew watch helplessly as the plasma bolt arrives and the transmission ends. Hansen was played by Garry Walberg.