Kim Possible (2002)

S2E11 The Fearless Ferret

While volunteering to assist elderly residents, Ron ends up at the home of Timothy North, a grumpy older man who has turned away all helpers. To Ron's surprise, he uncovers that Timothy is actually the legendary superhero known as The Fearless Ferret, whom Ron idolizes. Timothy chooses Ron to inherit the mantle of The Fearless Ferret, but he must keep this new role a secret, even from Kim. As Ron faces off against The White Stripe, he realizes being a hero is far tougher than he imagined, while Kim grows suspicious of Ron's odd behavior.