Who said "When you believe in yourself, anything is possible."?

This quote is attributed to Underdog.

When you believe in yourself, anything is possible. - Underdog

"When you believe in yourself, anything is possible."

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."