These are the top 20 most popular TV episodes based on critical acclaim and audience reception:

1. “Breaking Bad” – “Ozymandias” (Season 5, Episode 14)
2. “The Twilight Zone” – “To Serve Man” (Season 3, Episode 24)
3. “The Simpsons” – “Marge vs. the Monorail” (Season 4, Episode 12)
4. “Game of Thrones” – “The Rains of Castamere” (Season 3, Episode 9)
5. “The Office” – “Dinner Party” (Season 4, Episode 9)
6. “The Sopranos” – “Pine Barrens” (Season 3, Episode 11)
7. “Friends” – “The One Where Everybody Finds Out” (Season 5, Episode 14)
8. “Lost” – “The Constant” (Season 4, Episode 5)
9. “Twin Peaks” – “Pilot” (Season 1, Episode 1)
10. “The X-Files” – “Clyde Bruckman’s Final Repose” (Season 3, Episode 4)
11. “Stranger Things” – “The Upside Down” (Season 1, Episode 8)
12. “The Walking Dead” – “Days Gone Bye” (Season 1, Episode 1)
13. “Seinfeld” – “The Contest” (Season 4, Episode 11)
14. “Doctor Who” – “Blink” (Season 3, Episode 10)
15. “The West Wing” – “Two Cathedrals” (Season 2, Episode 22)
16. “Black Mirror” – “San Junipero” (Season 3, Episode 4)
17. “The Handmaid’s Tale” – “Offred” (Season 1, Episode 1)
18. “Sherlock” – “A Scandal in Belgravia” (Season 2, Episode 1)
19. “Buffy the Vampire Slayer” – “The Body” (Season 5, Episode 16)
20. “The Big Bang Theory” – “The Bath Item Gift Hypothesis” (Season 2, Episode 11)