Shows that could use an adult reboot.

[Chris Lang]

He-Man and the Masters of the Universe: DC comics, in the early 80's before the Filmation series, did have somewhat darker Masters of the Universe comics, where He-Man cursed Skeletor with "May the dark gods burn his evil soul!" and while Cringer was lazy and complaining, his Battle Cat alter-ego stated his eagerness to rend the flesh of his enemies (though was never seen doing so onscreen). Teela described Prince Adam as someone who spends a lot of time 'wenching and carousing'. And Skeletor? Skeletor got in a fight with another wizard and set him on fire in the three-issue mini-series.

So there's precedent for a darker Masters of the Universe than Filmation's rather silly version (the one everyone remembers). A darker reboot could take it to another level, maybe even give darker backstories for Skeletor and Beast-Man, as well as delve deeper into the politics of Eternia.

[Rev9]

Gravity Falls with a dark twist would be cool

[Sutekh]

A more grown up take on Thundarr the Barbarian or Space Ghost could indeed rock, as could a version of Dora the Explorer that goes all Tomb Raider with her as an adult.

But my vote is for a live-action grown-up Kim Possible.

[K7P5V]

But my vote is for a live-action grown-up Kim Possible.

Me too. But personally, I'd be fine with an anime version of the hit series.

[the illustrious mr. kenway]

Sonic the Hedgehog .

Maybe they could do a spoof of FRIENDS and have Sonic and his friends deal with their greatest challenge yet...their 20s.

Super Mario Bros-
Some fanart got me thinking about it. Granted some of these are more genre reimaginings.

https://www.deviantart.com/wonderful...Bros-857775027

https://www.deviantart.com/jpzilla/a...epts-479480762

https://www.deviantart.com/ultimatel...sign-426591776