"Trick or Treat Scooby-Doo!" sees the Scooby-Doo gang’s Halloween plans thwarted by ghost-like doppelgangers, and the special grabbed fans' attention by having Velma fall for a female love interest, villain Coco Diablo. Coco's relationship with Velma got a positive reception, leading many fans to wonder about Coco’s voice actress Myrna Velasco’s resume.