Is Twilight Zone is scare?

Yes, for some people. suspense was open-looped as the show did not have the reassuring device of a regular cast of characters ( unlike Star Trek, for example) plots could go anyway, doom and terror themes, a general preoccupation with the morbid and occult, were dominant. There were no regular cast members o no ( Hook of Hope). a very, very small element of Twilight Zone plots- one dealing with Art Carney and Santa Claus- did NOT feature death or morbid plot lines, but these were distinctly in the minority. Plots tended towards the Nightmarish, some were indirectly based on historical accidents- but they did not venture into (Titanic) Waters.