- "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 Eva Sinclair
- Eriq La Salle as Hektor Martin
- Max Ehrich as Hunter May
- Gia Mantegna as Lily Walters
- Megan Ketch as Harriet Bigelow
- Allie McCulloch as Dava Bloom
- Vince Foster as Kyle Lee
- Roger Floyd as Beau Griffith
- Shane Callahan as Roger Lopez
- Hannah Jelinovic as Charlotte Chastain
|(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"