I only have a very faint memory of a weird sci-fi-ish cartoon that was shown in the early 80’s. I think I remember the creatures eating some kind of green food out of a can.
I’m pretty sure it came on during the day but I think it was a special. It may have been shown around Thanksgiving. The color scheme was dark, it wasn’t at all funny or cute, and I think it may have been either futuristic or oriented in some sort of other planet. I think there may have been some sort of lesson intended to be taught. It was in English and I think American made. Thanks.