Haunted Door

References:
Panel 1: The Kingston Mansion from the S1 opening of Scooby Doo! Where Are You? And also was the location the gang were at in “What The Hex Is Going On?”

Panel 2: A Boo from the Mario Series

Panel 4: The painting in the background is the Ghost of Elias Kingston, ironically, the ghost who was haunting that mansion. And in the urn, a Ghastly from Pokémon shows up.

Panel 5 and 6: The door that attacks Mondo is called a NokNok from Mario Wonder