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Dr. Double X (DC) — First appearance, key issues & comics · Cape Zone

DD

No image in Comic Vine.

Character/DC

Dr. Double X

energy duplicate of Dr. Simon Ecks

49 appearancesSince 1958

Dr. Double X first appeared in Detective Comics #261 (1958-11), published by DC. 49 appearances are indexed across 41 series.

Character history

Key issues

2 issues

Detective Comics
#261
first appearance · intro
1958-11-00
Batman
#75
death
2019-09-00

Across the catalog

Appears in

41 series

Detective Comics
1937–2011
2 issues →
Crisis on Infinite Earths
1985–1986
2 issues →
Young Justice
1998–2003
2 issues →

Batman Eternal cover

Batman Eternal

2014–2015

2 issues →

Batman Eternal cover

Batman Eternal

2014–2015

2 issues →

Batman cover

Batman

2016–2026

2 issues →

Batman cover

Batman

2017–2020

2 issues →

ACTCape Archive 2021

Arkham City: The Order of the World

2021–2022

2 issues →

Batman cover

Batman

1940–2011

1 issue →

World's Finest Comics cover

World's Finest Comics

1941–1986

1 issue →

The Brave and the Bold cover

The Brave and the Bold

1955–1983

1 issue →

The Batman Family cover

The Batman Family

1975–1978

1 issue →

Who's Who: The Definitive Directory of the DC Universe cover

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

1985–1987

1 issue →

Crisis on Infinite Earths cover

Crisis on Infinite Earths

1998–1998

1 issue →

Crisis on Infinite Earths cover

Crisis on Infinite Earths

2000–2000

1 issue →

Justice League Adventures cover

Justice League Adventures

2002–2004

1 issue →

Batman: Dark Detective cover

Batman: Dark Detective

2005–2005

1 issue →

Crisis on Infinite Earths The Absolute Edition cover

Crisis on Infinite Earths The Absolute Edition

2005–2005

1 issue →

Batman: Dark Detective cover

Batman: Dark Detective

2006–2006

1 issue →

Titans cover

Titans

2008–2011

1 issue →

Super Friends cover

Super Friends

2008–2010

1 issue →

Titans cover

Titans

2009–2010

1 issue →

DCU: Legacies cover

DCU: Legacies

2010–2011

1 issue →

Legends of the Dark Knight: Marshall Rogers cover

Legends of the Dark Knight: Marshall Rogers

2011–2011

1 issue →

Show all 41 series ↓Show less ↑

Super Friends: Mystery in Space
2011–2011
1 issue →
Tales of the Batman: Carmine Infantino
2014–2014
1 issue →
Crisis on Infinite Earths Deluxe Edition
2015–2015
1 issue →
Young Justice
2017–2022
1 issue →
Batman: The Brave and the Bold - The Bronze Age Omnibus
2017–2021
1 issue →
Batman: Rebirth Deluxe Edition
2017–2018
1 issue →
Crisis on Infinite Earths: 35th Anniversary Deluxe Edition
2019–2019
1 issue →
BDECape Archive 2019
Batman: Deluxe Edition
2019–2022
1 issue →
The Joker: The Bronze Age Omnibus
2019–2019
1 issue →
Tales of the Batman: Steve Englehart
2020–2020
1 issue →
BCOCape Archive 2020
Batman: City of Bane: The Complete Collection
2020–2020
1 issue →
Batman / Superman: World's Finest
2022–
1 issue →
ACTCape Archive 2022
Arkham City: The Order of the World
2022–2022
1 issue →
Batman by Tom King
2024–
1 issue →
Crisis on Infinite Earths 9 (Facsimile Edition)
2025–2025
1 issue →
Crisis on Infinite Earths 10 (Facsimile Edition)
2025–2025
1 issue →
DC Finest: Batman: Red Skies
2025–2025
1 issue →