Some may live and die by combing through episodes for Velma/Daphne subtext and the lopsided rhombus of unrequited love orbiting a talking dog, others may devote themselves to charting the parallels between Mystery Inc. and The Many Loves of Dobie Gillis, but I will fight tooth and nail over the idea that there should never, ever be even a trace of the supernatural in the world of Scooby-Doo.