OuterSpace is an underground hip hop duo from North Philadelphia. Originally a trio consisting of three Puerto Rican friends that then took the artist names Planetary, Jedeye and Crypt the Warchild. The founding member Mario Collazo (Planetary) was then attending 10th grade, while the other two, Richard Cruz (Jedeye) and Marcus Albaladejo, were in 8th grade.

Army of the Pharaohs is an American underground hip hop collective originating from Philadelphia, Pennsylvania, formed by Jedi Mind Tricks founder Vinnie Paz in 1998. The collective has strong links to other underground east coast groups such as OuterSpace, Snowgoons, La Coka Nostra, Demigodz, 7L & Esoteric, and JuJu Mob. AOTP's affiliations and member roster has changed several times since its formation.