- For other uses, see Rubicon.
The RSE Rubicon was a D7-class Romulan battle cruiser starship, specifically of the K't'inga-class, in service of the mirror universe's Romulan Republic in the 23rd century.
The Rubicon was one of three battle cruisers, along with RSE Actium and RSE Pharsalus, that intercepted the ISS Excelsior when it crossed from Klingon space to Romulan territory in 2293. In order to keep the presence of Excelsior a secret, Captain Hikaru Sulu (who had assumed the mirror Sulu's place on Excelsior) was forced to order his fighters to destroy the Romulans. (TOS video game: Shattered Universe)