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PRE-FINALE: On the eve of May Sweeps, April 26, Jane Lynch returns as Diana to indirectly deliver “a huge break” in the Reid case, says showrunner Erica Messer. In the same episode, Joe Mantegna’s daughter Gia reprises her Season 3 guest star role, though a tight-lipped Messer files the why of that under “spoiler.” For the final two episodes of the season, titled “Green Light” and “Red Light,” the Case of the Week “is 100 percent centered around Reid,” all building to what Messer calls “a satisfying end to the journey that he has been on” since midseason.
SEASON FINALE (MAY 10): As Reid’s arc winds down, Messer says to expect “some surprises” — including one dropped on the BAU by no less than Derek Morgan (guest star Shemar Moore), who resurfaces for the episode as a civilian. Ultimately, the season ends with “a good, old-fashioned cliffhanger,” which the following quote might shed some light on: “Scratch will definitely still be playing a part, all the way to the last frames of the finale.” Adds Messer, “Just when we think we’ve got a handle on things, you get another curve ball.”