Event series Under the Dome returns for a third season with a special two-hour premiere on its new night, Thursday, June 25 at 9 p.m. ET/PT before moving to its regular time period on Thursday, July 2 at 10 p.m. immediately following Big Brother. CSI alum Marg Helgenberger joins the cast “in an extended story arc, beginning with the premiere episode, as the town’s inhabitants figure out the Dome’s purpose and what it wants from them.” Under the Dome was last summer’s most-watched (11.32m) and highest-rated scripted program in adults 18-49 (2.8/09) and adults 25-54 (3.7/10).

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