Dark Shadows - Season 6 Episode 203 Necking in the afternoon.
Overview: Ben kills Nathan and Natalie before they can harm Barnabas. In the present Willie and Julia wait for Barnabas to return, however he never does. Willie checks the mausoleum but Barnabas is not in the coffin; shortly after Willie leaves the chains re-appear around the coffin and Barnabas is trapped inside. Josette appears to Willie, crying; he is convinced that Barnabas is in the coffin now.