Hack O'Hara was a hardscrabble cabbie, struggling to make a living in the big city.
- Hack O'Hara drove a taxi cab.
- O'Hara's money-hungry attorney, G.G., would sometimes involve himself in Hack's adventures.
- The Hack O'Hara feature ran from Crack Comics #21 to Crack Comics #62. Artists on this feature included Lou Fine, Bob Fujitani, Alex Koda, Joe Giella, and Clark Williams.
- Appearances of Hack O'Hara (Quality Universe)
- Images featuring Hack O'Hara (Quality Universe)
- Quotations by or about Hack O'Hara (Quality Universe)
- Character Gallery: Hack O'Hara (Quality Universe)