Strange Alliance

Katherine wants to make sure Pam doesn't change her mind about marrying Mark Graison. Sly continues to work for Cliff Barnes. Lucy is determined to find out what is "wrong" with Peter Richards because he refuses to date her. Jessica Montford makes her brother Clayton uncomfortable by bringing up stories from his past in Ellie's presence. Pam tries to protect Mark from learning about his health problem. J.R. prepares Detective McSween to do some "work" on Peter. Bobby and Mark vow to be enemies. Despite Sue Ellen's concern for Lucy, J.R. insists that Peter continues to come to Southfork. Jessica reminisces about her early years with Clayton. Charlie gets along with Christopher very well. Jenna Wade tells Bobby that she won't wait for ever. Sly tells Cliff that J.R. fears Barnes-Wentworth will become bigger than Ewing Oil. Cliff is mad to learn that Westar hit oil and he still hasn't. Jessica and J.R. find out they have a lot in common.

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S07E26 - Blow Up