Nemesea is a Dutch alternative rock band, formed in September 2002 in Groningen, The Netherlands by singer Manda Ophuis and guitarist, songwriter Hendrik Jan 'HJ' de Jong and shortly thereafter completed with Sonny Onderwater on bass. Initially, Nemesea were a symphonic gothic metal act, and were compared to Dutch compatriots After Forever. However, since 2007's In Control, the band's music has become more rock-oriented, also incorporating strong electronic influences.
Following a three-song demo, Nemesea had their first performance as support act for After Forever in the P60 Amstelveen and remained that band's support for a year. They attracted record company interest and signed for the Dutch independent label Ebony Tears in November 2003.