Timebomb is U.D.O.'s fourth album. It was recorded and mixed at Dierks Studios in Cologne from November 1990 to February 1991. This album is the band's most brutal, following a light approach on Faceless World.
The band was aided by Deaffy on lyrics. Deaffy was also the author of the English lyrics on the Accept albums, and is a pseudonym for Gaby Hoffmann (maiden name Hauke), manager of Accept and later married to the guitarist Wolf Hoffmann.
This was the band's last release with Mathias Dieth and Thomas Smuszynski (who went on to join Running Wild in 1992). It was also their last release until 1997's Solid; in the time between, Udo Dirkschneider took part in the Accept reunion which resulted in three albums.