Scary TV episodes in non horror series?

[Trevor]

McCloud:  SOMEBODY'S OUT TO GET JENNY 😳

The Professionals: DISCOVERED IN A GRAVEYARD

Space 1999: DRAGONS DOMAIN

[zombie no.one]

hmmm a few episodes of TJ HOOKER got unusually dark. BIG FOOT is one (not about an actual bigfoot lol)

[zombie no.one]

There's an episode of THE BIONIC WOMAN where Jamie Sommers has a prolonged mental freakout while in solitary confinement in jail. it's kind of harrowing to watch considering the usual tone of the show

[pacman000]

Not scary as an adult, but as a kid:

Pokemon, The Ghost of Maiden's Peak

One of the main characters becomes obsessed with a statue of a woman outside a shrine. The other characters try to break him of his obsession, & are attacked by ghosts.

Has a rather creepy (for a kids show) shot of several translucent, skull-like ghosts surrounding the characters which cackling.