Supergirl

PRE-CRISIS DEATH APPEARANCE: Crisis on Infinite Earths #7 (October 1985)
FIRST POST-CRISIS APPEARANCE: Superman/Batman #8 (May 2004)
FIRST POST-FLASHPOINT APPEARANCE: Flashpoint #5 (October 2011)

Kara Zor-El was a young girl when her home planet of Krypton teetered on the edge of destruction. In a last ditch attempt to save her life, her parents placed her into an escape pod to be launched into space alongside one containing her infant cousin, Kal-El. Ideally, she would land in the same place as Kal and help raise him in Kryptonian customs and ways—but unfortunately, fate had other plans.

Kara's pod was knocked off course after launch during a Kryptonite meteor shower, causing Kara to be locked in suspended animation for the extended duration of her trip. Rather than landing on Earth alongside Kal-El, she arrived decades later after Kal was already grown and operating as Superman.

Confused and lost, Kara spent her first several days on Earth unable to speak any language other than Kryptonian, being examined thoroughly by both Superman and Batman who believed her to be a trick or a DC Super-Villain's scheme to get close to the Justice League. But, as they were able to confirm her identity, Superman came to mentor Kara in both in the customs of Earth and in the art of harnessing her Kryptonian abilities for good. She donned the crest of the House of El and became Supergirl once and for all.