The Vampire Diaries (2009)

S8E10 Nostalgia's a Bitch

Sybil seeks vengeance on Damon, trapping him in a catatonic state. Meanwhile, Caroline and Bonnie delve into Damon's mind, encountering familiar figures from his past. They soon realize that Stefan holds the crucial answer to Damon's destiny. As the clock ticks down, a battle ensues between Sybil and her sister Seline for control of the bell, intensifying the urgency of their mission.