Supergirl #61
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After fighting off her own gang of super-villains, who appear and disappear without a trace, Kara travels to Gotham to save Robin from the same fate. And if that's not enough for you there's a touching (if slightly forced) moment between Lois Lane and Supergirl that goes further in validating Kara than any super-villain knockdown ever could.
There are a couple of nagging issues here (the most obvious being the continuity issue surrounding Blue Beetle's involvement in this story), but it is FUN and a far cry from the dreary story arcs the character was stuck in just a few months ago. Definitely worth a look.
[DC $2.99]