Michael Holt is a professor of physics in the parallel reality known as Earth-2. Like his New Earth counterpart, Professor Holt is married to a woman named Paula and was expecting his first child. But unlike Holt of New Earth whose wife and child died, Professor Holt's family survived. It was their survival that prevented him from following the chain of actions that resulted in his counterpart becoming the costumed Mr. Terrific.
As one of the lead authorities on parallel dimensions of his source Earth, Professor Holt developed a miniture cosmic treadmill that allowed the dimensionally-displaced super-hero Power Girl to successfully return to New Earth.
- Also unlike his New Earth counterpart, Holt is apparently a devout Christian, since his wife survived the accident which killed her counterpart.
- 3 Appearances of Michael Holt (Earth-2)
- 2 Images featuring Michael Holt (Earth-2)
- Quotations by or about Michael Holt (Earth-2)
- Character Gallery: Michael Holt (Earth-2)
- Michael Holt at dccomics.com
- Michael Holt at Wikipedia.org
- Justice Society of America (Volume 3) #18