Out of Continuity Series

Superman Adventures

Based on TV’s Superman: The Animated Series. Recommended issues for Supergirl: #21, #39, #52.

Superman Adventures #21 – “Last Daughter of Argo”
This Supergirl origin story is a sequel to the TV episode “Little Girl Lost”. Kara must face down three criminals who have escaped from the Phantom Zone.
Superman Adventures #30 – “Family Reunion” Part 1
Superman travels to another dimension where he meets evil, brainwashed versions of himself and Supergirl.
Superman Adventures #31 – “Family Reunion” Part 2
Superman Adventures #39 – “Reunion”
Sequel to the TV episode “Last Daughter of Argo”: Kara In-Ze and Superman must defeat Brainiac and an android which has assumed the name and face of Kara’s deceased mother.
Superman Adventures #41 – “22 Stories in a Single Bound”
Supergirl appears in a cute one-page story entitled “Supergirl’s Secret Emergency Weapon” – view here.
Superman Adventures #52 – “A Death in the Family
Kara is stricken with a deadly Argoan virus, and it looks like only Lex Luthor may have the cure.
Superman Adventures #66 – “Power Play!” Part 2 (cameo in one panel, no lines)

Justice League Unlimited

Based on TV’s Justice League Unlimited. Recommended issues for Supergirl: #7, #16, #20.

Justice League Unlimited #7 Justice League Unlimited #10 (small role)
Justice League Unlimited #13 (cameo) Justice League Unlimited #16
Justice League Unlimited #20 Justice League Unlimited #22 (appears in few panels, no lines)
Justice League Unlimited #31 (one panel, no lines) Justice League Unlimited #41 (cameo)

Trinity

Trinity is a weekly series published by DC Comics from June 2008 to May 2009. A version of Kara Zor-El from a magically-altered timeline, known as Interceptor of the JSI (Justice Society International), appears in the backup feature starting in issue #25. The full series is available on Comixology and reprinted in three volumes.

Issue Collection
Trinity #25 – Nov 28, 2008 Trinity Vol. 2
Trinity #28 – Dec 10, 2008 Trinity Vol. 2
Trinity #29 – Dec 10, 2008 Trinity Vol. 2
Trinity #30 – Dec 24, 2008 Trinity Vol. 2
Trinity #31 – Dec 24, 2008 Trinity Vol. 2
Trinity #32 – Jan 07, 2009 Trinity Vol. 2
Trinity #33 – Jan 14, 2009 Trinity Vol. 2
Trinity #34 – Jan 21, 2009 Trinity Vol. 2
Trinity #35 – Jan 28, 2009 Trinity Vol. 2
Trinity #36 – Feb 4, 2009 Trinity Vol. 3
Trinity #37 – Feb 11, 2009 Trinity Vol. 3
Trinity #38 – Feb 18, 2009 Trinity Vol. 3
Trinity #40 – Mar 4, 2009 Trinity Vol. 3
Trinity #42 – Mar 18, 2009 Trinity Vol. 3
Trinity #43 – Mar 25, 2009 Trinity Vol. 3
Trinity #44 – Apr 1, 2009 Trinity Vol. 3
Trinity #46 – Apr 15, 2009 Trinity Vol. 3
Trinity #47 – Apr 22, 2009 Trinity Vol. 3
Trinity #48 – Apr 29, 2009 Trinity Vol. 3
Trinity #49 – May 6, 2009 Trinity Vol. 3
Trinity #50 – May 13, 2009 Trinity Vol. 3
Trinity #52 – May 27, 2009 Trinity Vol. 3

Ame-Comi Girls (Digital First)

Ame-Comi Girls: Power Girl: Chapter 3 Aug 13, 2012
Ame-Comi Girls: Supergirl: Chapter 1 Aug 12, 2012
Ame-Comi Girls: Supergirl: Chapter 2 Aug 27, 2012
Ame-Comi Girls: Supergirl: Chapter 3 Sep 3, 2012
Ame-Comi Girls Chapter 1 Sep 10, 2012
Ame-Comi Girls Chapter 5 Oct 12, 2012

Note: this series was cancelled after chapter 22 before resolving its story.

Smallville Season 11 (Digital First)

Smallville Season 11 Chapter 44 (last page) Apr 26, 2013
Smallville Season 11 Chapter 47 May 17, 2013
Smallville Season 11 Chapter 48 May 24, 2013
Smallville Season 11 Chapter 49 May 31, 2013
Smallville Season 11 Chapter 51 Jun 14, 2013
Smallville Season 11 Chapter 52 Jun 21, 2013
Smallville Season 11 Chapter 53 Jun 28, 2013

Other

DC Universe Online Legends #26 Mar 21, 2012
Scribblenauts Unmasked: A Crisis of Imagination #4 Sep 26, 2015