Yet another of my fave childhood cartoons. I no longer remember much about this show, beyond that I enjoyed it - and that it had a great theme song!

And here that song is!

The lyrics:

[There's no need to fear, / Underdog is here!] // (Wa-ooo, wa-ooo, wa-ooo, wa-ooo, wa-ooo, wa-ooo.) // When criminals in this world appear / And break the law that they should fear / And frighten all who see or hear, / The cry goes up both far and near / For Underdog (Underdog), Underdog (Underdog). // Speed of lightning, roar of thunder, / Fighting all who rob or plunder, / Underdog, Underdog, Underdog. // (Wa-ooo, wa-ooo, wa-ooo, wa-ooo, wa-ooo, wa-ooo.) // When in this world the headlines read / Of those whose hearts are filled with greed / And rob and steal from those in need, / To right this wrong with blinding speed / Goes Underdog (Underdog), Underdog (Underdog). // Speed of lightning, roar of thunder, / Fighting all who rob or plunder, / Underdog, Underdog, Underdog.

Please check out the following list of titles and celebrities I've created TMDb threads for: https://www.themoviedb.org/list/118052