History of character has not yet been written.
- This version of Chop-Chop (Quality Universe), including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. Even though versions of the character may have since appeared, this information does not apply to those versions.
- In 1956, DC Comics obtained the rights to the Quality Comics characters, and re-introduced them 17 years later as the Freedom Fighters in Justice League of America #107 (October 1973).
- The Freedom Fighters were relocated to a parallel world, one called "Earth-X", where Nazi Germany had won World War II. The team was featured in its own series for 15 issues (1976–1978), in which it temporarily left Earth-X for "Earth-One" (where most DC titles are set).
- In 1981, some Quality Characters became recurring guest-stars of All-Star Squadron, a superhero-team title set on "Earth-Two", the locale for DC's WWII-era superheroes, and at a time prior to when the Freedom Fighters were supposed to have left for Earth-X. They later appeared with the rest of DC's superheroes in Crisis on Infinite Earths, a story that was intended to eliminate the confusing histories that DC had attached to its characters by retroactively merging the various parallel worlds into one. The Freedom Fighters became a mere splinter group of the All-Star Squadron.
- Comic book stories from the 1940s may depict some ethnic and racial prejudices that were once commonplace in American society. Such depictions were wrong then and are wrong today. While not representing the DC Comics view of today's society, these stories are being indexed and summarized as they were originally created, because to do otherwise would be the same as claiming these prejudices never existed.
- 186 Appearances of Chop-Chop (Quality Universe)
- 2 Images featuring Chop-Chop (Quality Universe)
- 1 Quotations by or about Chop-Chop (Quality Universe)
- Character Gallery: Chop-Chop (Quality Universe)
- Chop-Chop at dccomics.com
- Chop-Chop at Wikipedia.org
- Who's Who: The Definitive Directory of the DC Universe #2 (Blackhawk Squadron profile page)