Star Trek: 10 Best Klingon Episodes

10. Enterprise - Affliction & Divergence

While Enterprise does have its fans, it's certainly not a favorite for many Star Trek watchers. It retconned a few things that the Star Trek elite had taken as gospel for a long time. You have to be careful if you're gonna change the facts Trekkers hold dear. But retconning can also be a power that's used for good. Take Klingon forehead ridges as a case in point.

In The Original Series, Klingons had flat, ridgeless foreheads. By the time the movies started, they definitely had ridges and that look persisted for the next few series. But Enterprise was set before TOS and Klingons had ridges. In the two part story that played out across "Affliction" and "Divergence," the reasons for this change were explained as a virus that impacted many Klingons, removing their ridges.

The virus was stopped with the assistance of Doctor Phlox, preventing it from impacting all Klingons. Over the generations, the impact of the virus lessened and eventually disappeared entirely.

It was the best possible explanation for a change in the story that worked across all series. These aren't necessarily the best episodes of any Star Trek series that you're going to watch but they did tie up a huge plot hole that had been plaguing the Star Trek universe for years, one fans wanted an answer to.