The crew of the USS Mercury, NCC-99812, took time to enjoy the Menthar Anchorage, and after a short shore leave, the crew returned to the Mercury to begin their next mission. During a staff meeting, Captain Tallis Rhul received a call from the bridge that three Cardassian Galor-class starships had taken attack postures with weapons targeting the Oracle-class starship. Tallis spoke with the lead Cardassian commander, Gul Torolan Thenek, who informed Tallis that the Mercury would escorted back to Federation space for violation of the Cardassian/Federation treaty.
When Tallis diplomatically asked for an explanation of the alleged violations, Thenek stated that another Federation starship had entered the Menthar Corridor. Knowing nothing of a second vessel in the corridor, Tallis asked for proof of the allegations. The gul sent sensor data to the Mercury. Lieutenant Commander Arden Cain and Major Jacen Fanel recognized the name of the second Federation vessel, the USS Nimitz, which was identified by its warp signature. The Nimitz had been assimilated by the Borg over a year ago and had disappeared. After reviewing the Mercury crew’s explanation and data, Thenek agreed to allow the Mercury to investigate along with his three ships.
While planning the Mercury’s next course of action, Tallis received a subspace communication from Starfleet that his brother was missing and presumed dead. Unwilling to accept the finality of that news, Tallis resigned his commission and set out to find his brother. Starfleet Command re-assigned Commander Miles Unum to replace Tallis as the commanding officer of the Mercury.