Going under the guise of freeing Marty's spirit, they lure Jeannie to hand them Marty's watch and cufflinks, which they plan to use to remove his spirit from the Earth. All the while through this episode Marty's health deteriorates and the psychic susses him out and he nearly disappears completely during the exorcism. However, making a last minute plea to Jeff to save him, Marty makes Jeff realise they'll go to Marty's grave to complete the exorcism.
Marty
Jeff