There's no need to fear! Underdog is here!  
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!

** The original airing order of the episodes is not available, but if you uncover it or have some info to add, please submit it. Thanks. **