Okay, this definitely sounds like a horror movie reboot of the worst variety, and sounds like the single worst variant of the "wrestlers in movies" movies ever - and trust me, THAT'S pretty damn low. At least in even the worst of those movies, they at least TRIED to get the wrestlers to show a fraction of their in-ring personas, rather than just give them identity-less roles where they don't even so much as show their face.
As for that one last bit at the end, here is my approximate thought process:
(Sees some sort of cartoon with a bunch of WWE stars needing to battle some sort of monster terrorizing the ring)
"Huh... this sounds interesting. I mean, it seems to be dropping more B-List names than a TMZ "news" segment, isn't showing dialogue from the wrestlers that the movie is clearly starring, and doesn't really show that much action for a cartoon literally set in a Pro Wrestling arena, but I'm not sure why MovieBob would rank this as just one step above Leprechaun Origins-"
(Sees Scooby Doo show up)
"(Jaw drop) ........What?"
(See that the cartoon is "Scooby Doo: Wrestle Mania Mystery")
"...........WOW this must mean the WWE is getting really desperate to maintain some relevance in this decade."
And the ***** of it is that I would totally check it out if it was just the WWE guys needing to put the smackdown on the monster, but when SCOOBY AND THE GANG show up?! Now I won't touch that with a seventeen-foot pole!!