"Ground Zero" was a Federation mission in Star Trek Online. It was formerly the tenth mission of the "Romulan Mystery" episode, but was combined with its sequel "Taris" as part of the 29 January 2015 revamp of the mission series for the game's fifth anniversary.
The supernova acted counter to almost all we know about this type of phenomena. The initial explosion converted the mass of the planets it consumed into energy, which then travelled through subspace. Ultimately, the Romulus System was destroyed, and along with it, the Romulan homeworld.
Admiral Janeway conducted the first scientific survey of the Hobus system in 2388. Since then, we've been sending ships out on a regular basis to survey the system and attempt to determine a cause for what happened.
I need you to conduct your own investigation. Perhaps, after all this time, the U.S.S. <shipname> will be the one to solve the mystery.
Reman Commander Karatek instructs the player not to go deeper into the Hobus system than the third planetoid. The player studies the planetoid and detects traces of protomatter and silver fragments from a short distance away. The IRW Sithesh opens fire, but the player forces it back into cloak and scans the second planetoid, revealing evidence of a failed mining operation and traces of protomatter, decalithium, and tekasite, as well as a force field over the first planetoid. The Sithesh resumes its assault, but the player repels it and beams down to the first planetoid.
On the planetoid, the player collects samples of the three elements that he/she detected earlier, and battles Reman guards. Next, he/she consults with his/her away team and learns that the Hobus supernova may have been a deliberate act. The player stabilizes the Reman mining equipment to keep it from destroying the planetoid. Karatek beams down to attack but escapes before he can be defeated. The player beams back to his/her ship and confronts the Sithesh, destroying it in battle, before returning to Federation space to alert Admiral T’nae of his/her discovery.
|Federation episodes in Star Trek Online|
|Tutorial||Graduation Day • Training Cruise • Field Promotions • Communication Breakdown • Assimilation of the Innocent|
|(Tour of Duty)||(Prelude to a Crisis) • (Khitomer Crisis) • (The Price of Liberty) • (Assimilation) • (Gather Equipment) • (Line in the Sand) • Welcome to Earth Spacedock • (Skills Trainer) • (New Orders?)|
|Klingon War||Welcome to Earth Spacedock • Stranded In Space • Diplomatic Orders • Hide and Seek • Stop the Signal • Researcher Rescue • The Kuvah'Magh • (War is Good for Business) • Treasure Trading Station • Secret Orders • Task Force Hippocrates • Skirmish • Spin the Wheel • What Lies Beneath • Everything Old is New • Night of the Comet • The Ultimate Klingon • The Doomsday Device • City on the Edge of Never • Past Imperfect • Temporal Ambassador|
|Wasteland||Secrets of Nimbus • The Lost City of Paradise • Blind Men Tell All Tales • The Undying • A Fistful of Gorn • Installation 18|
|Romulan Mystery||Heading Out • (Under the Cover of Night) • (Minefield) • (Divide et Impera) • (Saturday's Child) • (Preemptive Strike) • (Hunting the Hunters) • (Project Nightingale • By Any Means) • (Ground Zero) • (Ghost Ship) • (Friend of My Enemy) • (Trapped) • (S'harien's Swords) • Empress Sela • Desperate Measures • Shadow Play • Taris • The Vault • Mine Enemy • Frozen • Coliseum • Cutting the Cord • Darkness Before the Dawn|
|Cardassian Struggle||Venture into Deep Space • Badlands • Suspect • War Games • Shutdown • Rapier • Forging Bonds • The Long Night • The Tribble with Klingons • Tear of the Prophets • Crack in the Mirror • The New Link • Seeds of Dissent • The Other Side • Cage of Fire • Second Wave • Of Bajor • Operation Gamma • Facility 4028 • Boldly They Rode|
|Missions in parentheses are no longer available as of the current version of Star Trek Online.|