I think that they should make a second simon and marcy because even though it will probley be sad if there is one. Because it would probley be about marcy leaving and simon turning into iceking. my  other thoughts are that  iceking is posed by his crown but what if the lich made the crown and billy fought the lich and the lich lost the crown then simon found the crown turened into iceking and if my theory is write that would explane why the lich took over billys body. well there are other reasons why the lich took billys body. like so finn would think the lich is billy so he could make a protal to make his wish of no won to live. and im just going to say somthing random i think they should do more adventuretime episods. and that if simon comes back that fionna and cake probley wont exzist.