S13, E4: Seeking revenge, Tommy McKay plants an explosive device in the unsuspecting Bobby's briefcase. At her sister April's expense, Michelle connives her way into Cliff's heart; Desperate to fulfill his secret oil contract, J.R. buys a battered and shabby tanker to transport the crude; Clayton and Ellie chase their mystery to the ramshackle town of Pride, Texas; Alex Barton sells one of Cally's paintings to an influential buyer; and Bobby sets Cliff straight as to who is in charge at Ewing Oil.