Alex Koch Alex Koch

Under the Dome's Sept. 16 cliffhanger will be all about "Junior, Junior, Junior," says executive producer Neal Baer of the CBS hit's seemingly ­demented deputy (Alexander Koch). "He has the biggest decision of his life to make."

Baer also teases that one character "will discover something about him or herself that will change everything for Chester's Mill." And expect one of those mysterious monarch butterflies to flutter back into the picture in a big way.

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