|A/K/A||Bill (Real Name)|
|Friends||Big Left Hand Guy, The Whammer|
|Abilities||Can Turn Invisible at Will|
|Voice Actor||H. Jon Benjamin|
He first appeared in the episode "Who is Ms. Question?" as a villain just graduating from the Coach's villain school. He later had a larger role starring in "The Invisi-Bill Hand", along with Big Left Hand Guy. The two worked together on a series of well-plotted crimes, where Invisi-Bill would invisibly steal something, and Big Left Hand Guy would hail a taxi to escape. However, when Invisi-Bill got left behind, their duo fell apart.
He had another large role in "Plain Old Mischief Makers", where Invisi-Bill and Big Left Hand Guy, at risk of having their supervillain status revoked by the Coach, attempted to successfully rob the Jewelry Store. While Big Left Hand Guy talked to Reginald, Invisi-Bill was supposed to steal the jewels, but their plan backfired. After the two were stopped by WordGirl, the Coach took away their supervillain status and they became Plain Old Mischief Makers.