Mickey the weasel is a supporting antagonist of Hey Arnold. He 5th grade student who seems to do Wolfgang's bidding.
In "Longest Monday", he tricks Arnold and Gerald, offering to help them avoid being put in the trash, but instead leads them straight to Wolfgang. It is here we learn that his nickname is "The Weasel".
In the episode "Chocolate Boy", he follows Chocolate Boy to ensure the deal with Wolfgang is not broken.
His last appearance is in "Gerald's Game", where he is one of the players and Gerald's subjects.