Yellow Devil MK-II

Yellow Devil MK-II (イエローデビル Ｍｋ－Ⅱ) is a powered up version of the Yellow Devil that appears as the boss of the second Wily Castle stage from Mega Man 3. Yellow Devil MK-II acts similar to the original version, but besides the "blocks moving pattern", he can also flow in a wave. Its weakness is the Hard Knuckle.

Other media
Yellow Devil Mark 2 appears in the story Metal Heart from Mega Man Megamix and Rockman Remix. His body was created by Dr. Wily, but his brain was taken from a broken toy robot from a junkyard. When activated, the Yellow Devil didn't obey Wily and he orders his Robot Masters from Mega Man 3 to bring he back, and if not possible, destroy him.



Trivia
In the manga, Yellow Devil Mark 2 only says "M".