In the rap underground, Danger Doom was a successful collaboration between producer Danger Mouse (known for his work with Gorillaz and his own production career) and rapper MF Doom (who has released albums under various aliases). The album The Mouse and the Mask showcased their talents blending seamlessly, despite initial doubts about their partnership. The project had been in the works for 18 months before its release, with contributions from characters from Cartoon Network's Adult Swim shows, culminating in its debut on Epitaph in October 2005.