Alexander Koch
Alexander Koch
Portrays James "Junior" Rennie
Occupation Actor
Born February 24, 1988
Grosse Pointe Park, Michigan, USA
Years Active 2011–present
Gender Male
Hair Brown
Ethnicity Caucasian-American
Alexander Koch Gallery

Alexander Koch is an American actor who portrayed James "Junior" Rennie in the first, second and third seasons of CBS' Under the Dome.


Alexander Koch was born and raised in Detroit, Michigan. Koch was heavily involved in both local community and high-school theater productions. He attended the Theatre School at DePaul University. Alexander Koch made his acting film debut as "Frank" in Eddie O'Keefe's independent short film The Ghosts. The film centers on "Frank", the tough yet thoughtful leader of the 1950's greaser gang, who descends on a modern town and falls in love with the daughter of a preacher. The film premiered at the 2011 Brooklyn Film Festival and went on to receive accolades from the Los Angeles Times, Chicago International Film Festival and Geneva Film Festival. Koch's stellar portrayal of "Frank" landed him in Los Angeles in 2012, where he auditioned for his first television pilot and was cast for the role of "Junior Rennie".

Selected FilmographyEdit

  • The Ghosts as Frank
  • Winter as Charlie
  • Always Shine as Matt
  • Underemployed as Man
  • The Insider as Himself
  • Good Day L.A. as Himself


Season 1 appearances
"Pilot" "The Fire" "Manhunt" "Outbreak" "Blue on Blue"
"The Endless Thirst" "Imperfect Circles" "Thicker Than Water" "The Fourth Hand" "Let the Games Begin"
"Speak of the Devil" "Exigent Circumstances" "Curtains"
Season 2 appearances
"Heads Will Roll" "Infestation" "Force Majeure" "Revelation" "Reconciliation"
"In the Dark" "Going Home" "Awakening" "The Red Door" "The Fall"
"Black Ice" "Turn" "Go Now"
Season 3 appearances
"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"

External LinksEdit