Supergirl #76 (1996)

Written by Peter David;
ART by Ed Benes and Alex Lei;
COVER by Rob Haynes
Linda Danvers, a.k.a. Supergirl, has met Kara Zor-El, a.k.a Supergirl...but is she the real deal? Linda's not sure, so she brings Kara to Metropolis to meet a real Kryptonian. Unfortunately, a lot of strange things in the big city are keeping the Man of Steel preoccupied...though they may tie in to the mystery behind Kara's arrival!