CBR ranks the 10 best television cliffhangers in the link below:
https://www.cbr.com/best-tv-cliffhangers/
10. Michael Resets The Cycle - The Good Place, Season 1, Episode 13, "Michael's Gambit"
09. Hank Schrader Learns Walter White's Identity - Breaking Bad, Season 5, Episode 8, "Gliding Over All"
08. Dolores Achieves Sentience, And The Hosts Attack - Westworld, Season 1, Episode 10, "The Bicameral Mind"
07. Ross Geller Says Rachel's Name - Friends, Season 4, Episode 24, "The One With Ross' Wedding – Part Two"
06. The Night King Takes Hardhome - Game Of Thrones, Season 5, Episode 8, "Hardhome"
05. Shooters Attack The President - The West Wing, Season 1, Episode 22, "What Kind Of Day Has It Been"
04. Sherlock Holmes Survives Moriarty's Plot - Sherlock, Season 2, Episode 3, "The Reichenbach Fall"
03. Captain Picard Becomes Locutus Of Borg - Star Trek: The Next Generation Season 3, Episode 26, "The Best Of Both Worlds Part 1"
02. Who Shot J.R.? - Dallas, Season 3, Episode 25, "A House Divided"
01. Jack Tells Kate They Have To Go Back - Lost, Season 3, Episode 23, "Through The Looking Glass Part 2"