When the Powerpuff Girls are called down for breakfast by the Professor, they get liver and onions, while the Professor gets a stack of pancakes. When the Professor, having not shaved, looks into a newspaper at an ad of a game show, Bubbles, thinking that it meant it was Saturday, and that he could spend the whole day playing with us, and he tells them not today and that he has a lot of work to do. This causes a small white creature to appear. The Professor, about to scrape his pancakes into the sink, orders the girls to eat their breakfast, claiming he went through a lot of trouble preparing the meal for them and telling them that he didn't want to see it go to waste. The girls also find out the Professor was just using a TV dinner. Later, the girls, without the Professor's knowledge of this, feed their liver and onions to a pack of stray dogs. They let him believe they finished their breakfast, causing the creature to get even bigger.
Later, he just keeps growing and growing when the girls lie after Bubbles (accidentally) colors on the wall and tries to hide it with a plant, Buttercup breaks the Professor's nerd award, Blossom overloads the washing machine by adding all of her own, her sisters' and the Professor's clothes and adding a whole box of soap to it, then Blossom's hair clogs the tub drain, Buttercup drinks from a jug of chocolate milk, and Bubbles messes with the Professor's potions, until finally, the monster grows into a scary monster that causes lots of trouble. When Blossom decides to tell the truth, she begins by confessing to having eaten Buttercup's chocolate bar. This causes the monster to shrink a bit, much to Buttercup's anger for finding out it was her. Blossom apologizes and promises her a new one. She brings the monster with her outside where the Professor is. The girls (at first except Buttercup, who then gives in) confess their lies. When the Professor tells them to keep it down because he is working in there, the monster begins growing again. That's where the girls find out he is lying and instead, watching a game show. They unplug the TV and interrogate him, and Blossom exposes the white lie to him. When Bubbles goads him into telling the truth, the Professor admits that he didn't have a lot of work to do, that he didn't slave away on the hot stove making their breakfast, and that he left the toilet seat up (the latter being much to the girls' confusion, as Buttercup saying she did the same thing caused the monster to shrink). Finally, the monster vanishes.
Finally, the mayor informs to the Professor that the white lie has now grown to a monstrous size, and is now attacking Townsville, due to a few promised he made, during his re-election speech.
- It's possible, he's a parody on Not Me, from Family Circus. A running theme in Family Circus is for a kid to do something bad, and when asked by their parents, who did the bad thing, they respond with "Not Me". A ghost character with "Not Me", written on his belly is then shown, acting mischievous. There was even a scene in the episode, where The White Lie left behind a dashed line, taking a jab at another recurring theme in the Family Circus comics, where kids run around, leaving behind dashed lines.
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