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Mark Winkle, portrayed by Aaron Jackson, is the keyboardist of the group and Sly's cousin, who differs from Sly in that Mark is depicted as less of a schemer and manipulator, and exhibits more of a naivete. In his introductory episode "The Unforgiven", it was revealed that he had been suffering from stage fright since an incident in which Sly yelled "hi-ho, Silver!" and galloped around the stage while Mark played the William Tell Overture (which also served as the theme to The Lone Ranger) during a performance at Carnegie Hall at age 11, which Sly made amends for at the end of the episode.