The monster will turn out to be Vince McMahon.
"It's me, Scooby! It was me all along!
"- Jossed.
- To be precise, Vince McMahon owns WWE and to have no Wrestlemania equals no business at all so jossed to the max.
The four girls watching the match on TV really are the superheroes from Young Justice.
Watching wrestling together is a regular thing for Cassie, Artemis, Zatanna, and "Megan."
Alternately, the four girls are the Hex Girls.
They're out of costume and recruited a fourth member to be the new "Crush", in reference to Daphne's brief performance with the band in Scooby-Doo! Mystery Incorporated.
