10 Star Trek Episodes With The Highest Stakes

10. Zero Hour

As Star Trek: Enterprise's third season came to a close, the stakes couldn't have been higher for Earth, Starfleet, and Captain Archer's crew. The Xindi Reptilians had gone rogue, breaking away from their council, destroying other Xindi who came to stop them, and were focused entirely on eradicating humanity. 

Not the nicest saurians in the galaxy.

The Xindi superweapon had been deployed, despite the efforts of the late lamented Degra, and was en route to Earth. If Archer and Hoshi couldn't stop it, it was curtains for our future. Earth had already felt the searing power of a miniature version of the deadliest ballgame in existence, with 7 million bodies lining those courts. 

Meanwhile, Enterprise itself was tasked with destroying the Sphere Builders' physical bases in the Delphic Expanse, lest they turn the galaxy into uninhabitable (for humanoids) waste. With the clock ticking to judgement day, it truly came down to the wire for Starfleet's first family - and as the dust settled, seemingly not all of our favourite faces made it back home again.