RUBBERDUCK

Who's Who: The Definitive Directory of the DC Universe #20

Earliest catalogued appearances of Sarge Steel and Serafina.

Oct 1986

No listings

Superman and Batman: World's Funnest #1"Last Imp Standing!"

Earliest catalogued appearance of Green Lantern (Tangent).

Jan 2001

No listings

Final Crisis #7

Earliest catalogued appearance of Calvin Ellis.

Mar 2009

No listings

The Multiversity Guidebook #1

Earliest catalogued appearances of Bat-Man and Phantom Lady (Becker).

Mar 2015

No listings

The Multiversity #2

Jun 2015

No listings

Convergence Harley Quinn #2"Rabbit Season"

Jul 2015

No listings

Convergence #8

Earliest catalogued appearance of Human Bomb (Mathis).

Jul 2015

No listings

Justice League Incarnate #3

Mar 2022

No listings

Harley Quinn #30"Girl in a Crisis, Part III; Everybody Hates Side Quests"

Jul 2023

No listings