Stockholm Heavy Metal band. Formative band members included guitarist Johan Ahlinger and the KEEGAN and HEXENHAUS credited drummer Ralph Ryden. 

HYDROGEN vocalist Nicke Olsson supplied guest vocals to GODPHOBIA's October 2006 demo recordings. HYDROGEN's debut album, 'Now is No More…', was released during 2007 via Cutting Edge Records. Bassist Palle Flensby quit in July 2008, but HYDROGEN regrouped by inducting STRESSFEST man Oliver Vowden as replacement plus second guitarist Chris. More changes saw drummer Martin opting out in October, being swiftly replaced by Tobbe.

In November 2008 bassist Oliver Vowden announced his departure from HYDROGEN "Due to differences in sound and direction."