Between Two Worlds is the only album by Norwegian black metal supergroup I. The album was recorded at the Lydriket Studio and later mixed by Peter Tägtgren at the Abyss studio. The album showcases Abbath's straightforward metal style rather than his black metal style. The album displays a clear influence from classic metal bands, which although present in Abbath's primary band Immortal, is here the sole focus of the music. A limited edition digipack was released, which includes three bonus tracks. A limited edition metal box was also released, also featuring the three bonus tracks, and was limited to 1000 copies.