I may be mistaken, my memory of this, the earliest series of the Superfriends, is a bit fuzzy, mainly because even as a child I thought this series lacked any redeeming factors whatsoever. But I believe this episode featured a look at Superman's origins. If I recall, the Villain's assistant was a big fan of Superman and admired him as a hero, so when he and his boss had Wendy and marvin as their "guests", big mouth Marvin told him the whole story behind Superman's beginnings, even going so far as to say he was found and adopted by Jonathan and Martha Kent when his ship crashed on Earth! Now, without trying to put too much logic into this, (especially given how inane and pointless this series was, in my humble opinion) one has to wonder first why if the bad guy admired Superman and thought he was such a great hero he allied himself with a villain in the first place, but also what Marvin was thinking?! The Wonder Twins (ie "Blunder" Twins as they would be more appropriately named)were bad enough when they showed up later, but Marvin and his Scooby-Doo ripoff Dog really makes you wonder why the Superfriends would waste their time with him?