10 Star Trek Episodes With The Highest Stakes

Though the stakes were high, thankfully this wasn't a galactic-life ender. At least, not in the short term anyway. The hostilities between the Federation and the Klingon Empire had been on a slow boil for decades by the time that Praxis exploded. Were it not for that, they could easily have erupted into open war again - spelling doom for all surrounding worlds.

When the cabal of traitors - ironically working together to derail the peace talks - did their best to assassinate anyone and everyone who might truly achieve peace, it was down to the Enterprise-A and the Excelsior to save the day. This was a mission of espionage, border violations, aerial battle, and a flagrant disregard for Khitomer's invite list. 

Kirk and Sulu overcome Chang, Spock exposes Valeris, Scotty whacks West, Uhura gets the ship across the border, Chekov discovers the crucial blood clue, and McCoy is getting too old for this sh*t - it's peak Original Series fare, with certainly quadrant-ic consequences if they fail. 

The crew's final journey was nothing if not spectacular.