Who said "Never give up, no matter how difficult the challenge."?

This quote is attributed to Underdog.

Never give up, no matter how difficult the challenge. - Underdog

"Never give up, no matter how difficult the challenge."

Underdog Perseverance

"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."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."