Marg Helgenberger is going ‘Under the Dome’ for Season 3, filmed in Wilmington, North Carolina.

Marg Helgenberger is going ‘Under the Dome’ for Season 3, filmed in Wilmington, North Carolina.

Marg Helgenberger is going 'Under the Dome' for Season 3, filmed in Wilmington, North Carolina.

Marg Helgenberger is going ‘Under the Dome’ for Season 3, filmed in Wilmington, North Carolina.

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