The season 2 finale of Amphibia. Known for two things: completely shattering the status quo, and the controversy surrounding its delay and subsequent leak.
King Andrias is
evil (well we already knew), Sasha betrays
Anne, Marcy had betrayed both from the beginning, King Andrias betrays all three, Marcy does more to redeem herself in five minutes than Sasha ever did during two seasons, Marcy dies (as in, out in a pickle jar by Andrias for whatever
evil purpose), Sasha is stranded in Amphibia,
Anne is stuck on
Earth. Also Anne is in denial about Marcy's death (even though she's not dead and she doesn't know that but...).