RING MY BELL

JAG knockout Catherine Bell recently shot a guest-star appearance for CBS' Threshold as a genetic engineer who, sources say, could become a recurring character should the sci-fi thriller receive a (much-deserved) full-season pickup. What's more, executive producer Brannon Braga revealed in a conference call with the press that Red Team member Lucas will get an as-yet-uncast fiancée and Lost creepazoid William Mapother's alien infectee from the series premiere will come back "in a very, very unexpected way."