A couple of times a year, Mattel issues new installments of their "Pop Culture" series. Recent ones have included KISS, AC/DC, THE GRATEFUL DEAD, ARCHIE COMICS, GENERAL MILLS, HERSHEY's and more. Now they're on at least the second batch of Hanna-Barbera vehicles, and they're hard to come by. We snagged their "Custom '77 Dodge Van" from the last Scooby-Doo batch, and while I may feature that soon, a more pressing issue is that our basic Mystery Machine has gone missing. It's... a mystery unto itself.