By A Mystery Man Writer
Captain Underpants': How Underoos Got Its Origin Story
The Secret Origin of Underoos: The Underwear That's Fun to Wear
7 things you never knew about Underoos
Underoos were not any more fun than other underwear, seriously - boing - Boing Boing BBS
7 things you never knew about Underoos
R5's Superheroine Musings
Official Dictionary of Unofficial English - A Way With Words
Underoos were not any more fun than other underwear, seriously - boing - Boing Boing BBS
Captain Underpants': How Underoos Got Its Origin Story
Underoos: The Underwear That's FUN to Wear!