Comic Title: Action Comics #398
Publisher: DC (National Periodical Publications, Inc.)
Address: 909 Third Avenue, New York, NY
Cover Date: March 1971
On Sale Date: January 28, 1971 Copyright Date January 28, 1971
Source: Library of Congress, Periodicals 1971

Frequency: Monthly
Cover Price: $0.15
Page Count: 32
Contains: Ownership Statement
Circulation: 330052
Editor: Murray Boltinoff

Title: "Spawn of the Unknown"
Pages: 8

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

Writer: Leo Dorfman
Penciller: Curt Swan
Inker: Murphy Anderson

Feature Character(s)

• Superman (last appearance in Action Comics #398; next appearance in Superman's Girl Friend Lois Lane #109)

Guest Star(s)

• Supergirl (last appearance in Action Comics #397; next appearance in Adventure Comics #405)

Villain(s)

• Three tomb raiders (no further appearances)

Other Character(s)

• Ituru (no further appearances)
• Professor Bruno (no further appearances)

Comments:
Untold Tales of the Fortress

Synopsis:
Superman is summoned to a volcanic crater in Africa where the botanist Professor Bruno was conducting experiments with plant life. An accidental explosion has compromised the experiment. When Superman arrives he sees several animals which have been transformed into strange plants. He then sees that Supergirl has also been affected.

Superman tries to help his cousin, but the plant wraps its branches around him. When Superman struggles to free himself, Supergirl's arms are ripped off. He is shocked. Suddenly, the real Supergirl arrives. She explains that that plants merely imitate other life forms. She then shows him another one that has taken his form. The Kryptonians then take the plants to another world where they can continue their existence. The Superman and Supergirl plants are put on display in the Fortress.