The Smurfs (1981)

S7E31 I Was A Brainy Weresmurf

After getting scratched by a piece of wolfbane, Brainy undergoes a transformation into a weresmurf. This unexpected change brings a whole new set of challenges as he struggles to control his newfound powers and instincts. As he grapples with his identity, the other Smurfs must band together to help him navigate this bizarre predicament and find a way to reverse the spell before it becomes permanent.