One Piece Whole Cake Island Episode 841 Escape From the Tea Party! Luffy vs. Big Mom! ( Air Date 2018-06-17 ) Genre Action & Adventure, Comedy, Animation category. Overview "The plan is executed to sneak the Straw Hats out of Big Mom's castle while hidden inside Bege! But the irascible Luffy can't resist getting in at least one punch against his foe! Meanwhile the Tamate Box slips into the hands of some surprising agent!".