History of character has not yet been written.
- enemy of the Huntress (Helena Wayne)
- This version of Seiji Kato (Earth-Two), 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 Seiji Kato (Earth-Two)
- 1 Images featuring Seiji Kato (Earth-Two)
- Quotations by or about Seiji Kato (Earth-Two)
- Character Gallery: Seiji Kato (Earth-Two)