On this week's episode of Supernatural…
Sam and Dean get a call from an old friend named Annie but she disappears in an old haunted house before meeting up with them.
The brothers investigate the house but find nothing.
Bobby, as a ghost, can see all the other ghosts trapped there by by head ghost, Whitman. He is getting more powerful by draining the other ghosts he's trapped.
Bobby finally manages to get the boys to recognize his existence and head back before going to burn Whitman's bones.
They burn Whitman, as well as the bodies of the trapped ghosts in the house.
Sam and Dean are finally able to see Bobby but remain wary of good things happening because he chose to stick around.