The Super Friends are thrust into a totally untenable situation in this 1978 offering.
Mr. Mxyzptlk (Frank Welker) fancies himself a filmmaker all of a sudden, and decides to write and direct "The Rise & Fall of the Super Friends". However, and predictably, the heroes find a way out of this mess.
We know Superman is vulnerable to magic, and so Mxyzptlk's spell works especially on him, just not enough to make him a ham actor. Bear in mind, too, this was made to capitalize on the live-action "Superman" feature film that came out earlier that year.