|Affiliation:|| Terran Empire|
|Final Assignment:||CO, ISS Constellation/ISS Doomsday Machine|
|Office Held:||war minister|
In 2277, under orders from Empress Hoshi Sato III, Decker led a fleet to the Terra Nova system in the hopes of ambushing and destroying the ISS Enterprise. When the Enterprise arrived in the system, Admiral Spock quickly surrendered and had himself beamed aboard the Constellation to hear the charges laid against him by Decker.
Unfortunately, Spock had managed to persuade the Constellation's first officer, Commander Hiromi Takeshewada, to lead a mutiny and assumed command of the Constellation after shooting Decker, in revenge for all the taunts that he had made against her. Spock succeeded Decker as Grand Admiral. (TOS - Mirror Universe novel: The Sorrows of Empire)
- An alternate version of the Mirror Universe's Matthew Decker can be found in the comic Fragile Glass.
|Grand Admirals of the Imperial Starfleet|
|Garth of Izar • Matthew Decker • Spock • Zhao Sheng|
|Emperor John Gill's cabinet|
|Melakon (security minister) • Rota Sevrin (science minister) • Tristan Adams (propaganda minister) • Raymond Stiles (genetic purity minister) • Harcourt Mudd (revenue minister) • Samuel Cogley (minister of vassal affairs) • Matthew Decker (war minister)|