Employee of MASA, Dr. Street was in charge of the Kat Sat 1 project. Unfortunately for him, when his satellite returned, it was coated with a “sticky slime” which contained an alien insect like creature called a Ci-Kat-A. Bitten by the Ci-Kat-A, Dr. Street was hypnotized into helping his “new master” and later transformed into a Ci-Kat-A like being himself. It is unknown if Dr. Street is still alive as he had fallen from Megakat Tower and was never seen again.
Dr. Street is apparently named for the real life Harley Street in London, which is famous for its private medical practices (although Street is an astrophysicist and not a medical doctor).
Street was planned to return in the season two episode The Doctors of Doom, in which he would’ve teamed up with Dr. Viper. He was ultimately betrayed by Viper and mutated into a giant scarab using Super-Katalyst 566, and sent to attack the Megakat Thermonuclear Plant, dying in battle against the SWAT Kats after Felina Feral knocked him into the flooded cooling tower of the planet where he drowned. However, the show was cancelled before the episode could be completed.