Who said "When danger calls, a hero must answer."?

This quote is attributed to Underdog.

When danger calls, a hero must answer. - Underdog

"When danger calls, a hero must answer."

Underdog

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

"When criminals in this city play, to steal the night and rob the day, they're out to make a dreadful mess, then Underdog is on the case."

"I'm just a pup who loves to help those in need."

"Even the smallest among us can make a big difference."