Tammy is considered the most "attractive" of the bikers and their final recruit. According to Letta, the leader of the Space Bikers, Tammy is "new", confirming this. Like her fellow bikers, Tammy is a fish-like humanoid alien who speaks in a high squeaky voice and enjoys causing havoc, destruction and pranks. She is also quite flirtatious (most notably around Brad), when compared to the rest of the bikers.
Despite her villainous wild side, she was actually an elementary school teacher on her home planet, and worked alongside the other bikers who were also part of the school's staff. She was a kind teacher who cared about her students. However the bikers naturally had a wild side, and due to the peaceful and friendly nature of their planet, they could never let it out, so they donned menacing biker personas once in a while in order to let loose some steam. Eventually when Jenny discovered this, she revealed their cruel and villainous biker nature to their people, who naturally banished them from their planet.