Question-and-answer sessions featuring “Doctor Who” starKaren Gillan, James Marsters(“Buffy The Vampire Slayer,” “Caprica”), Michael Rooker(“The Walking Dead,” Guardians of the Galaxy),WWE Superstar Big Show, “Heroes” cast members Milo Ventimiglia and Robert Knepper and other celebrities top the robust programming schedule at Wizard World Atlanta Comic Con, Friday through Sunday, May 30-June 1 at the Georgia World Congress …
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