Underground Theory, hosted by DJ Mista, aired on Sydney community radio station Radio Skid Row 2RSR 88.9 FM on Thursday nights from 11:30 PM to 1:30 AM starting in late 1995 and running until late 1996. It then changed its name to Diggin' In The Crates and in 1997 moved to a new time slot of 4PM to 6PM on Saturday afternoons. Co-host Chloe Lewis (a sister of one of the Metabass-n-Breath crew) joined at this time, bringing more of a commercial feel. The show led into Nino Brown's Flavour in ya Ear.

An emphasis was put on Australian hip-hop, pushing local artists, product, and shows. Guests such as DJ Soup, Thomas Rock, Phonetics, and Morganics would occasionally come through.

DJ Mista would later go on to briefly host a show on 2RDJ with a DJ named 9 Ways.

- Robert Sacchinelli, Mista