Theme song:
When criminals in this world appear
And break the laws 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!

When in this world the headlines read
Of those whose hearts are filled with greed
Who rob and steal from those who 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!