Question: Which episode of "Rick and Morty"  aired unannounced on April 1, 2017 and was replayed every half hour from 8pm to 12am ET, as part of Adult Swim's annual April Fools' prank?
Sentence (from "Great Blue Hill eruption prank"): On April 1, 1980, WNAC-TV aired a fake news bulletin that stated that Great Blue Hill was erupting.
Relevant evidence: No