Jeb (Christopher Pennock) and Carolyn (Nancy Barrett) marry, but a sinister shadow literally hangs over their future happiness. Sky (Geoffrey Scott) tries to free himself from the vampiric influence of Megan. And as the first step towards a brand new Dark Shadows story arc, Barnabas (Jonathan Frid) finds another hidden room in Collinwood -- this one a portal to a parallel world. This installment of Dark Shadows originally aired on March 12, 1970. ~ Hal Erickson, Rovi