There are two parts to the intro, easiest way to play them at the same time is with two people part (repeat x4) part (Play twice after 2nd repetition of intro A on another guitar) When criminals in this world appear and break the laws that they should fear And frighten all who see or hear the cry goes out for far and near for Underdog (underdog) Underdog (underdog) Speed of lighting, roar of thunder, fighting all who rob or plunder Underdog (ooh ooh ooh) Underdog (underdog) This chord progression is repeated throughout the whole song, except the ending which goes like this: Now unleash the dog of wonder, tearing evil souls asunder Underdog (bow-wow) Oh what a wonder-dog (and how) Now here's the epilogue (ooh) Underdog (underdog)
https://lyrics.primoaccordo.net/misc-cartoons/underdog-theme.htm