How many Twilight Zone episodes are there in all?

There are a total of 156 episodes of The Twilight Zone.

This includes:

* Original Series (1959-1964): 156 episodes

* The Twilight Zone (1985-1989): 44 episodes

* The Twilight Zone (2002-2003): 44 episodes

* The Twilight Zone (2019-2020): 20 episodes

Note that this count only includes those that aired on television, not the unaired pilots or other special projects.