The 21st SoonerCon also will welcome writers Eric Flint, Selena Rosen and Peter S. Beagle to the convention.
There will be a zombie walk again at noon Saturday.
“People have this real fascination with zombies,” Wall said.
“Maybe we all have a little bit of the undead inside of us that wants to get out ... it's grown up make-believe.”
Grown-up make believe will also be on hand for the time traveler's ball at 9 p.m. Saturday, and for the steampunk track of programming, including the “Steampunk Apocalyptic Survival Guide” and the “Steampunk Leather Workshop.”
Steampunk is an alternate-history science fiction genre that frequently features anachronistic technology.
SoonerCon will also screen a full-length film, made in Oklahoma, described as a “small-town superhero flick.” “The Unusual Calling of Charlie Christmas” will screen at 4 p.m. Friday and at 7 p.m. Saturday at the convention.