- "Four weeks ago, an invisible dome crashed down on Chester's Mill, cutting us off from the rest of the world. The dome has tested our limits. Forcing each of us to confront our own personal demons; rage, grief, fear. Now in order to survive, we must battle our most dangerous adversary, the enemy within."
- Mike Vogel as Dale Barbara
- Rachelle Lefevre as Julia Shumway
- Alexander Koch as Jim Rennie, Jr.
- Eddie Cahill as Sam Verdreaux
- Colin Ford as Joe McAlister
- Mackenzie Lintz as Norrie Calvert-Hill
- Kylie Bunbury as Dawn
Special Guest Star
- Shane Callahan as Roger Lopez
- Vince Foster as Kyle Lee
- Lee Spencer as Major Pracht
- Jerri Tubbs as Motorist Wife
- Macsen Lintz as Jason
|(S2) • Under the Dome Season Three episodes|
|"Move On" • "But I'm Not" • "Redux" • "The Kinship"|
"Alaska" • "Caged" • "Ejecta" • "Breaking Point"
"Plan B" • "Legacy" • "Love is a Battlefield" • "Incandescence" • "The Enemy Within"