Donatello and the Swede Syndrome is a fanfic written by Goddess of Idun, and published at Fanfiction Net on 28 March 2006. It takes place in the 2003–2009 animated TV-series.
Getting electrocuted and losing his memory, Donatello thinks he's Swedish. While written mostly in English, the story also has some phrases in Swedish. It also uses some New York City-Christmas setting, and scenes taking place in Sweden.