Christer Engen, also known by his stage name Chris Summers, is a Norwegian musician best known as the drummer for rock bands Turbonegro, Bigbang and Euroboys. Engen was a founding member of Bigbang and played with the band from 1992 to 1997. He left Bigbang to join Turbonegro in 1997 and released four studio albums with the band until his departure in 2008. Engen was enganged to singer Elvira Nikolaisen from 2007 to 2011.

Turbonegro is a Norwegian rock band, active from 1989 to 1998 and from 2002 to the present. The band combines glam rock, punk rock, and hard rock into a self-described "deathpunk" musical style.