One stormy night, adventurous teens Skip, April, and Augie--plus their dog Elmo--find and reset a broken grandfather clock, only to free two ghosts trapped inside: Revolutionary War-era coward "Muddsy" Muddlemore and his cat Boo. Now free, the phantom pair teams up with the crime-solving kids to crack some mind-boggling mysteries in this Hanna-Barbera cartoon, which aired from 1971-72. Voiced by Daws Butler, Tommy Cook. Micky Dolenz, Kristina Holland, and Don Messick.

17 episodes on 4 discs. 8 1/2 hrs. Standard; Soundtrack: English Dolby Digital mono.