The season one He-Man episode "Temple of The Sun" features some great action sequences, as He-Man and his friends attempt to save Zoar from Nepthu. Here we see Michael Swanigan's original storyboards for the highly memorable moment when He-Man effortlessly demolishes a Sand Demon by using his bare hands. Granted, the Sand Demon in these storyboards is a lot different to what we see in the actual episode, but at the time the model sheet for that particular character had not been assigned. The action and fury of this scene is beautifully expressed in these illustrations!
(click on the image to see it at full-size)