The Fuzzy Channel

I used to have an indoor TV antenna, I didn't get many channels, however, it was just enough to watch a few channels that aired reruns of classic TV shows from the 50's and 60's. I would sometimes get channels that were a little fuzzy, but I could still make out what was on them. I would sometimes flip to these channels and see if I could decipher what movie or show was playing on it.
One day, I was bored and flipped to one such channel, where some animated show was playing. There wasn't any intelligible audio, so I only had visuals to go off of. There were three teenagers sitting around a campfire, a skinny blonde girl in a green dress who had a passing resemblance to Daphne from Scooby-Doo, a muscular boy with brown hair who was wearing an orange shirt and blue jeans, and a skinny boy with brown hair who was wearing all black.
After talking around the fire for a little, the girl went off to do something, the two boys started to talk about something, however, after a few seconds, they look to the left with shocked expressions on their faces before running in the direction of whatever caught thier attention.
It cut to an image of the girl, dead, with her brain removed. There wasn't any blood, but it was still surprisingly graphic, and I was genuinely caught off-guard at the sight. The two boys ran back to the camp site, the muscular one ran to his truck, while the skinny one started packing up. The teen at the truck tried getting it to start, only to see something from his rear view mirror. The program cut to a scene where the skinny boy was getting attacked by a strange, furry creature with red eyes and a lamprey like mouth, the creature easily picked up the squirming teen and put the top of his head into his mouth before seemingly sucking out his brain. Just as the creature killed the skinny one, it noticed the one in the truck and started approaching the truck. Right as the creature got to the back of the truck, the channel cut out, being replaced by static.
I upgraded to a Roku about a week later, and no matter how hard I searched online, I could not find the animation I saw that night. If anybody has any idea what I watched that night, let me know. I want to know what the context was and how it ends.
Category:Lost Media
Category:Original
Category:TV
Category:Unknown
Category:Unknown episode