Superman Fan Podcast. That episode can be found here.
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NEXT WEEK: Kara comes to Earth, puts on a magic show, and doesn't get adopted in Action Comics 252-254
IN TWO WEEKS: Supergirl starts a gang and is disowned by Superman in Adventure Comics 381-382
IN THREE WEEKS: Supergirl's awesome, yet complex Post-Crisis origin begins in Superman 21-22 and Adventures of Superman 444
IN FOUR WEEKS: Kara comes to Earth again in Superman/Batman 8-10