Comic Title: Adventure Comics #390
Publisher: DC (National Periodical Publications, Inc.)
Address: 909 Third Avenue, New York, NY
Cover Date: Mar/Apr 1970
On Sale Date: January 8, 1970 Newsstand Date January 8, 1970
Source: Comic Reader, #76

Copyright Date January 8, 1970
Source: Library of Congress, Periodicals 1970

Newsstand Date January 13, 1970
Source: House Ad, Phantom Stranger #6, Page 10

Frequency: Monthly (semi-monthly, March)
Cover Price: $0.25
Page Count: 64
Editor: Mort Weisinger

See Also: The Guide to DC Giants

Notes:
This issue is labeled Giant #G-69.

Title: "The Great Supergirl Mirage"
Pages: 7

Feature(s):
Supergirl (of Earth-1)

Writer: Otto Binder
Artist: Jim Mooney

Reprinted From:
Action Comics #256 (1959)

Feature Character(s)

• Supergirl (last appearance in Action Comics #255; next appearance in Superman's Pal, Jimmy Olsen #40)

Supporting Character(s)

• Dick Malverne (an orphan boy; last name is Wilson in this story; next appearance in Action Comics #282)

Other Character(s)

• A Supergirl robot (no further appearances)

Synopsis:
While secretly performing good deeds as Supergirl, a boy from the Midvale Orphanage, Dick Wilson, takes a picture of her. He suspects Linda Lee is Supergirl, when he sees her turn in a report that she finished at super-speed. Linda makes an excuse that she had a copy of the finished report elsewhere, but Dick is not convinced.

While looking for minerals for Geology class, Dick tricks Linda by throwing a dummy of himself off a cliff. Linda’s X-ray vision ignites chemicals which Dick coated the dummy with. Linda causes lightning to strike the dummy to cover her mistake. Dick is still convinced she is a Supergirl.

Dick tries to trick Linda again with heavy dumbbells. Linda falls for the trick, but her powers allow her to once again cover her mistake and protect her identity. She is distressed over the situation when a Supergirl robot arrives to perform amazing feats at a show. Dick is now convinced that he saw the Supergirl robot sent by Superman, and that Supergirl does not exist.