Alexander Koch is an American actor. He played the series regular role of Junior Rennie on the CBS drama series Under the Dome, based on the novel by Stephen King. Alex Koch appears in the fifth season of Lucifer as Ella Lopez's new love interest, Pete Daily. He co-starred in the 2020 meta-thriller Black Bear.

Under the Dome is an American science-fiction mystery drama television series. It premiered on CBS on June 24, 2013 and concluded on September 10, 2015. The series was developed by Brian K. Vaughan and based on Stephen King's 2009 novel of the same name.