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Superhero toys have to get an episode somehow, but there's a bunch of different ways to approach it. I think Mego in general will get an episode eventually, since they keep featuring that former Mego head across different episodes. World's Greatest Super Heroes is such an important line in the history of superhero toys, to say nothing of figures in general since all the licenses they have is arguably the predecessor to modern collector's lines. They could just do a Mego episode in general focussing on their output from the 70's/80's.
The secret Wars and Super Powers toylines are two other toylines that are really notable. But what I'd like them to do is something on Batman toys from the late 80's movie through the 90's BTAS line, because its had such an effect on superhero toys and basically what every other superhero line copied for a while. The movie lines pushed for variants of batman to fill out a line. And most importantly,the TAS line was the first time they really focussed on designing toys based on a cartoon rather than a comic(although the Super Powers toyline was effectively a SuperFriends toyline, it was heavily based on current comic aesthetics just like Superfriends itself). To this day you see companies emphasize the more cartoony style for kid's toylines over more detailed comic styles.