4. The Conscience Of The King (Episode 13)
The Plot: A Shakesperean actor aboard the Enterprise may be the mass-murderer Kodos The Executioner!
The Screw Up: So, there's this dude named Kodos and he was the Governor of the Tarsus IV colony and is responsible for the deaths of 4,000 colonists. There are also 4,000 survivors, yet only 9, ever saw his face. 9. 3,991 of the survivors had never even seen a picture of the guy? Out of a colony of only 8,000 people, that seems damn near impossible.
Cool Trivia: The aliens
Kang and Kodos from The Simpsons after named after
Kang the Klingon and Kodos the Executioner.