Events & eras On screen Lore Members Activity

Cosmic Boy (DC) — First appearance, key issues & comics · Cape Zone

Cosmic Boy portrait

Character/DC

Cosmic Boy

Rokk Krinn of Braal

977 appearancesSince 1958

Cosmic Boy first appeared in Adventure Comics #247 (1958-04), published by DC. 977 appearances are indexed across 60 series.

Also known as Rokk Krinn

One of the founders of the Legion of Super-Heroes and its first leader.

Character history

Key issues

10 issues

Adventure Comics
#247
first appearance
1958-04-00
Adventure Comics
#353
death
1967-02-00
Superboy
#180
origin retold
1971-12-00

Across the catalog

Appears in

60 series

Adventure Comics
1938–1983
79 issues →
LCape Archive 1993
Legionnaires
1993–2000
45 issues →

Secret Origins #6 cover

Secret Origins

#6

origin retold

1974-01-00

DC Super Stars #17 cover

DC Super Stars

#17

1977-11-00

Secrets of the Legion of Super-Heroes #1 cover

Secrets of the Legion of Super-Heroes

#1

1981-01-00

Secrets of the Legion of Super-Heroes #2 cover

Secrets of the Legion of Super-Heroes

#2

1981-02-00

Legionnaires Annual#1Cape Archive1994

Legionnaires Annual

#1

1994-07-00

Superman & Batman: Generations III #12 cover

Superman & Batman: Generations III

#12

2004-02-00

DC Super Stars 17 (Facsimile Edition) #[nn] cover

DC Super Stars 17 (Facsimile Edition)

#[nn]

2020-06-00

The Legion of Super-Heroes

1980–1984

31 issues →

Legion of Super-Heroes cover

Legion of Super-Heroes

1989–2000

30 issues →

Action Comics cover

Action Comics

1938–2011

28 issues →

The Legion cover

The Legion

2001–2004

28 issues →

Superboy cover

Superboy

1949–1977

26 issues →

S&TCape Archive 1977

Superboy & the Legion of Super-Heroes

1977–1979

20 issues →

Legion of Super-Heroes cover

Legion of Super-Heroes

1984–1989

20 issues →

LOSCape Archive 2011

Legion of Super-Heroes

2011–2013

19 issues →

TOTCape Archive 1984

Tales of the Legion of Super-Heroes

1984–1987

18 issues →

SATCape Archive 2006

Supergirl and the Legion of Super-Heroes

2006–2008

18 issues →

Adventure Comics cover

Adventure Comics

2009–2011

17 issues →

The Legion of Super-Heroes Archives cover

The Legion of Super-Heroes Archives

1991–2012

13 issues →

LOSCape Archive 2005

Legion of Super-Heroes

2005–2006

13 issues →

Legion of Super-Heroes cover

Legion of Super-Heroes

2010–2011

12 issues →

Superman cover

Superman

1939–1986

10 issues →

Legion of Super-Heroes cover

Legion of Super-Heroes

2020–2021

10 issues →

The Best of DC cover

The Best of DC

1979–1986

9 issues →

Superman cover

Superman

2023–

8 issues →

Secret Origins cover

Secret Origins

1986–1990

7 issues →

The Legion of Super-Heroes in the 31st Century cover

The Legion of Super-Heroes in the 31st Century

2007–2009

7 issues →

Valor cover

Valor

1992–1994

6 issues →

LSOCape Archive 2011

Legion: Secret Origin

2011–2012

6 issues →

Show all 60 series ↓Show less ↑

Justice League vs. the Legion of Super-Heroes
2022–2022
6 issues →
Superman's Pal, Jimmy Olsen
1954–1974
5 issues →
KKCape Archive 1976
Karate Kid
1976–1978
5 issues →
Showcase Presents: Legion of Super-Heroes
2007–2014
5 issues →
DC / WS DreamWar
2008–2008
5 issues →
Final Crisis: Legion of Three Worlds
2008–2009
5 issues →
LOSCape Archive 1973
Legion of Super-Heroes
1973–1973
4 issues →
Legionnaires Three [Legionnaires 3]
1986–1986
4 issues →
Cosmic Boy
1986–1987
4 issues →
The Final Night
1996–1996
4 issues →
LLCape Archive 2000
Legion Lost
2000–2001
4 issues →
Limited Collectors' Edition
1972–1978
3 issues →
DC Special Blue Ribbon Digest
1980–1982
3 issues →
Secrets of the Legion of Super-Heroes
1981–1981
3 issues →
TLOCape Archive 1982
The Legion of Super-Heroes Annual
1982–1984
3 issues →
Crisis on Infinite Earths
1985–1986
3 issues →
Legends
1986–1987
3 issues →
Adventures of Superman
1987–2006
3 issues →
Zero Hour: Crisis in Time
1994–1994
3 issues →
LACape Archive 1994
Legionnaires Annual
1994–1996
3 issues →
Showcase '96
1996–1997
3 issues →
Genesis
1997–1997
3 issues →
Justice League Adventures
2002–2004
3 issues →
Booster Gold
2007–2011
3 issues →
The Brave and the Bold
2007–2010
3 issues →
DCU: Legacies
2010–2011
3 issues →
LOSCape Archive 2012
Legion of Super-Heroes
2012–2014
3 issues →
Justice League United
2014–2016
3 issues →
Legion of Super-Heroes: The Silver Age Omnibus
2017–2020
3 issues →
The Flash
2023–
3 issues →
Superman Annual
1960–1986
2 issues →
DC Comics Presents
1978–1986
2 issues →
Superman
1987–2006
2 issues →
Flash
1987–2006
2 issues →
Legion of Super-Heroes: The Great Darkness Saga
1989–1989
2 issues →
Legion of Super-Heroes Annual
1990–1996
2 issues →