- "Three 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. Pitting us against one another. Forcing each of us to confront our own personal demons; rage, grief, fear, shame. But we've also found love under the dome and we have battled to keep our town together. Now we may have finally found a way out. We hope it takes us home, but what if it takes us to an alternate reality?"
- 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
Special Guest Star
- Grace Victoria Cox as Melanie Cross
- Max Ehrich as Hunter May
- Brett Cullen as Don Barbara
- Ryan Shams as Groundskeeper
- John Elvis as Benny Drake
- Mike Whaley as Malick
- Shelton Grant as Guard
- Edward Gelhaus as Skinhead
- Hailey Wist as Amy
- Josué Gutierrez as Gangster
|(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"