No producer credits, but these are three fine audio adventures. The actor playing Superman in particular is spot-on; sounding commanding and powerful yet friendly and intelligent.
And--does this even need to be said?--Neal Adams' cover art is phenomenal. I love how mean and angry Luthor looks (this Luthor doen't need some silly battlesuit to fight Supes!) and Mxyzptik looks odd and creepy (the voice of Mxy on the record matches the look, as well).