Lightwave, Heatwave, and Radiowave (better known as the Frequency Fiends) are the three worst personalities of Gosalyn brought to life as evil
energy beings when she was hit by an experimental weapon from S.H.U.S.H in "The Frequency Fiends". Lightwave (voiced by Elizabeth Daily) is yellow and is Gosalyn's mischievous side and can shoot laser beams, Heatwave (voiced by Pamela Adlon) is red and her anger and can shoot fire, and Radiowave (voiced by Sherry Lynn) the leader, is green and her ego and can control anything that uses radio waves, such as R/C cars. Radiowave considers herself the most powerful of all. Darkwing, Gosalyn and Launchpad sought help from Megavolt to stop them. By accident using positive waves instead of negative waves, the energy beings were merged into a three-headed giant. They were finally defeated by negative waves and dispersed. Megavolt stated that they can reform themselves through someone’s television and need a particle accelerator to escape. As the scene irises out, the energy beings ask the viewer to free them.