Dreadnought cannon

The Dreadnought cannon was a weapon capable of destroying a planet.

History
It was developed secretly by the Klingon Empire in the 2270s to be used as a first-strike weapon. It was constructed and installed in a Klingon starship. However, in 2273 the dreadnought containing the cannon was destroyed by "Critters", a race which had previously attacked the USS Farragut (NCC-1702) in 2257 and captured a D7/ in 2267. The wreck was discovered by the refit USS Enterprise (NCC-1701) and the ChR. Romulan subcommander T'Cel and Rear Admiral James T. Kirk mutually agreed not to report the discovery so as to avoid all-out retaliatory war. To ensure a balance of power with the Klingons, however, Kirk informed the Klingons that he’d saved a copy of the cannon’s schematics.

In 2286, Montgomery Scott, Kevin Riley and Tom Garrovick used those schematics to rebuild the dreadnought cannon for use against the Critters. Phoenix provided raw materials for construction, and work proceeded as Kor’s IKS Revenge engaged the "Critters" starship. The Critter ship cocooned Revenge and opened a wormhole to return to its origin point. Survivors from the Klingon ship were beamed to the Enterprise. As the Critter ship entered the rift’s event horizon, Riley fired the cannon at Revenge. Energy from the antimatter annihilation plus the weapon’s continued firing triggered a supernova-like explosion which annihilated the wormhole, the weapon and the Critter vessel. The sector would not be navigable for nearly 100 years.