Elizabeth Morgenstern was an Earthforce Captain and the commanding officer of the EAS Pollux an Omega class destroyer, during the Earth Alliance Civil War. She was promoted recently enough that John Sheridan, who only split with Earthforce a year and a half prior to the Battle of Proxima III, was unfamiliar with her, and was likely promoted for political reasons.
She was a hardline loyalist to President Morgan Clark and participated in the 2261 blockade of Proxima III. She was responsible for the destruction of five commercial transports carrying injured people from areas hit by Clark-loyalist forces. The deaths of 10,000 civilians due to Morgernstern's actions led Sheridan to decide it was time to attack Clark's forces and liberate Earth.[1]
Captain Morgernstern took the Pollux into battle when the Army of Light attacked the fleet blockading the planet during the Battle of Proxima III. She along with the rest of her crew were killed when a White Star ship crashed into the Pollux, destroying both vessels. [2]