Mutton for Nothing/Dr. Wendal and Mr. Taz Taz-Mania : Season 1 Episode 41

Taz arrives at the sheep meadow to fill in for Ralph Wolf. There Sam Sheepdog performs his usual predator-pounding job on him. Wendal Wolf steps into a gamma-radiation chamber by mistake instead of a tanning booth. That causes him to transform into a violent monster each time Taz upsets him.