Serpents of Yesterday

Serpents of Yesterday is the series premiere of Starship Republic Season One.

Plot
While on a mission to a sector the crew of the USS Republic is training cadets that are on field training mission, and without knowing it that they've crossed into Klingon Space three Klingon Warships decloak and start attacking the ship and kills 30% of the crew including the Captain and it's up to a young Cadet to save the ship and crew before the Klingons destroy the Republic.