Jennifer Garner decided not to be the part of big screen version of Dallas the minute she found out Jennifer Lopez is to play JR’s wife Sue Ellen. I think it was a wise decision, it would be a bit of a strain between them. I mean I wouldn’t want to be on the same set with my hubby’s ex, or maybe it’s just me thinking like that. Anyway the producers have to find somebody new for Bobby Ewing's wife Pam role.