In this story, Zero performs an incantation by drawing a circular pattern -- or zero -- that transports him into the past and which also summons ghosts.
Script credit suggested by the Who's Who.
Artist correction from Joe (who did not exist) to John Devlin made by Craig Delich 2013-4-6.
All Gustavson credits verified and courtesy of Terry Gustafson, son of Paul Gustavson.
Last appearance of the "Rusty Ryan" feature for a while; it will be replaced next issue by its own spinoff, "Rusty Ryan and the Boyville Brigadiers". The "Rusty Ryan" feature will return in issue #101.