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Professor Dalton created a machine which could duplicate matter. Unfortunately, this machine created imperfect duplicates. One day, the machine's ray accidentally created an imperfect duplicate of Superboy. This short-lived creature was called Bizarro. Year later, the villainous Lex Luthor intentionally rebuilt Dalton's flawed machine in order to create an adult Bizarro.
- This version of Professor Dalton (Earth-One), including all history and corresponding appearances, was initially erased from existence following the collapse of the original Multiverse in the 1985-86 Crisis on Infinite Earths limited series. However the ending of Convergence retroactively prevented that collapse, saving all the alternate realities, though in an "evolved" form. Even though versions of the character may have since appeared, this information does not apply to those versions.
- 3 Appearances of Professor Dalton (Earth-One)
- 2 Images featuring Professor Dalton (Earth-One)
- Quotations by or about Professor Dalton (Earth-One)
- Character Gallery: Professor Dalton (Earth-One)