Superman #21 (1988) Vintage Supergirl Saga, Part 1, "You Can't Go Home Again"

As people in battlesuits watch within a beleaguered high-tech fortress on a devastated world, Superman finds himself being followed, but can't seem to find the person following him until he picks up the heartbeat, indicating a female. Superman catches the person from behind, and he is surprised to find a young blond-haired woman wearing a female version of a Superman costume. The woman identifies herself as Supergirl, and surprises Superman again by transforming herself into the red-haired likeness of his Smallville sweetheart Lana Lang, before knocking Superman away with a telekinetic blast and turning herself invisible. 

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