2: The majority of the episode is dedicated to debunking the ominous or paranormal thing's existance, or is presented as a dream sequence.
3: The last shot shows that it either WAS real, or wasn't a dream sequence. It is also never mentioned again.
Rugrats
Rugrats Rugrats S2 E 12 - The Inside Story
-TODO
Rugrats S2 E 15 - Visitors from Outer Space
-TODO
Rugrats S2 E 20 - My Friend Barney
-TODO
Rugrats S3 E 11 - The Mysterious Mr. Friend
-TODO
Rugrats S3 E 13 - Destination: Moon
-TODO
Rugrats S3 E 17 - Chuckie's Wonderful Life
-based off the popular christmas story. Chuckie says he's going to run away because people are better off without him and an angel shows him a world without him where everything is miserable. Most upsetting, Tommy is homeless and visibly starving. Played for jokes but is honestly pretty weird. Chuckie gets fed up of the world without him and asks to be taken back home, which he is. It's revealed that he was just having a dream. Chuckie looks out the window to see the angel from "his dream" is real, and drives a motorcycle into the sun, making physical contact with it. He's never seen again.
Rugrats S3 E20 - The Alien
-Chuckie's dad builds a mini house for the babies to play in, but Angelica can't fit inside it. Out of spite, she tells the babies not to go in because it's Chuckie's "mothership" and he's an alien. She knows because she broke in to the Finster property at night to see that his dad is also an alien and is giving a press conference to another alien. Chuckie's alien design has a huge zipper on his back to reveal he is a bipedal reptillian. The majority of the episode is about Chuckie trying to prove he isn't an alien using different tests, and interestingly, he fails almost all of them. Tommy says he doesn't care if Chuckie is an alien or not. Chuckie says you can't be too sure who's an alien and who's not. The closing shot shows the playhouse rocketing into space with all the babies inside.
Hey Arnold
Hey Arnold S1 E 8 - The Haunted Train
-TODO
Hey Arnold S2 E 3 - Four Eyed Jack
-TODO
CatDog
CatDog S2 E 19 - The End
-TODO
The Wild Thornberries
Season 1 Episode 8 - Only Child
The Thornberry's are at the amazon river. Eliza sees a river dolphin and tries to talk to it, but it leaves. A few moments later, a girl named Jao finds the Thornberry camp and immediately makes friends with Debbie. Eliza wanders off and comes across a fisherman who warns her to stay away from the water because the Botu is coming out tonight due to the full moon. He explains that a Botu is a river dolphin who takes the form of a girl and walks on land, he mentions you can tell a Botu from a normal girl because they will only eat fish and always wear a hat to cover their blowhole. Eliza begins to believe that Jao is a Botu due to her not knowing anyone from the local village, always wearing a hat, and even crocodiles she talks to can provide more evidence. She becomes obsessed with proving that she is a Botu, and tries to snatch her hat away while everyone is eating together. She obviously gets in trouble for being so rude and she leaves. She encounters the fisherman again and she explains what happened, and he says the Botu will try to take other girls back into the water and turn them into dolphins. Eliza starts going back to camp to try to convince everyone again, but heavy rains begin and the camp quickly begins to flood. Eliza makes it back in time, but Debbie doesn't. A river dolphin, implied to be Jao saves Debbie as Eliza is apologizing profusely over the sound of the rain. Debbie is able to make it back to the comvee and Eliza thanks the dolphin and quickly after, a second dolphin jumps out of the water. The episode closes with Eliza saying "Good. she's got a friend."
Wild Thornberrys S1 E 11 - Blood Sisters
-The Thornberrys travel to Cusco to meet up with Dr. Spinoza - who is studying vampire bats in the area, which the family wants to do as well. They go to where he is supposed to live, only to see that a weird man dressed like dracula lives there and constantly speaks about being a member of the undead and acting really strange. They go through some hijinks where the kids are convinced that Dr. Spinoza is a vampire but the truth is more troubling than their hypothesis.
Wild Thornberrys S1 E 14
The Thornberrys are hanging out with some folks from the Masaai tribe, and while practicing throwing spears, Eliza gets close to the edge of the forest known as Naimna Enkiyio where a young girl went missing. The other Masaai kids she is playing with warn her not to go any closer because it's said that she was taken by the monster who lives at the bottom of a pit within the forest, or perhaps the giant warriors who are said to live there as well. Eliza, trying to prove her bravery, decides to venture in. Immediately, the other kids return to the village to get some of their warriors to help find her. They begin searching for her, and Eliza mistakes them for the giants mentioned earlier. She gets more and more scared, seeing visions of the missing girl, finding her jewelry, and she becomes totally lost. She begins to hear a voice calling her name which doesn't sound like any of the known characters and it leads her towards the edge of the forest and then it stops. Eliza begins to hear her mother calling for her over the intercom of their vehicle, and comes to the conclusion that the little girl guided her far enough that she could hear her mother calling. The episode ends with the silhouette of the girl in the form of leaves, watching Eliza and the villagers.
Wild Thornberrys S2 E 10 - You Ain't Seen Nothing Yeti
The Thornberrys are in Nepal, aiming to study snow leopards. Using a local guide, they reach the top of the summit where the cats are said to live, only to find a resort under construction which will put the endangered leopards' population further at risk. The locals are terrified of the Yeti to the point that they end up abandoning the party. Following the template seen many times here, evidence mounts that there may be a Yeti, only to reveal that it's a naturalist in a Yeti costume trying to play into local beliefs to discourage further encorachment on the leopards' habitat.
The myth appears to be debunked, until near the end of the episode. Eliza and her new found friends try to make an active move to scare off the construction workers and are quickly under pursuit-- that is, until they are saved by "the yeti". This yeti is not the same person as before -- the naturalist is at an entirely different location. Notably, this other Yeti does not have any visible seams on "his costume"
Wild Thornberrys S2 E 12 - Show me the Bunny
The Thornberries are in Finland and Debbie is bored and keeps re-reading the same tabloid about alien rocks being in the area.