When the gang finds that Velma's uncle Dave Walton has gone missing, they set out to rescue him from his captor — the legendary Willawaw, an owl-like beast which is said to capture people if an owl calls their name.
This episode includes examples of the following:
- Border Patrol: Velma's uncle Dave works as one of their agents.
- He Knows Too Much: The human behind the Willawaw orders Velma's uncle Dave kidnapped when he realizes Dave's on their trail.
- Ominous Owl: The Willawaw, a giant owl-like cryptid, which serves as the main villain. Likewise, its Owlmen, a pair of anthropomorphic owls.
- Our Cryptids Are More Mysterious: The giant owl, Willawaw, and his Owlmen.
- "Scooby-Doo" Hoax: The Willawaw is the disguise of a giant hot-air balloon being used in a smuggling operation.
