Marko Kristian "Markoolio" Lehtosalo (born 1 January 1975 in Lahti, Finland) is a Swedish-Finnish singer, musician, songwriter, actor, and comedian.

When Lehtosalo was six months old, his family migrated from Finland to Sweden where he grew up completing primary and secondary school in the small Stockholm suburb of Orminge.

Following the completion of his compulsory military service as a coastal ranger sniper in Ekenäs, Finland, he returned to Sweden.

He also played the titular character of Doktor Mugg and starred as Tyke Mörbult in Hem till Midgård.

[3] On 19 November 2013, Markoolio tried to disrupt the sleep of the Portugal national football team ahead of the second leg of their World Cup play-off with Sweden.