Comic Title: Adventures of Rex the Wonder Dog #20
Publisher: DC (National Comics Publications, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: Mar/Apr 1955
Approx. On Sale Date: January 4, 1955 Copyright Date January 2, 1955
Source: Library of Congress, Periodicals 1955
Until 1958 DC did not report actual on sale dates to the copyright office
The publication dates listed in LoC records are NOT release dates.

Frequency: Bi-monthly
Cover Price: $0.10
Page Count: 32
Editor: Julius Schwartz

Title: "The Thundering Earth"
Pages: 10

Feature(s):
Rex the Wonder Dog (of Earth-1)

Writer: Robert Kanigher
Penciller: Gil Kane
Inker: Bernard Sachs

Feature Character(s)

• Rex the Wonder Dog (last appearance in Adventures of Rex the Wonder Dog #19; next appearance in Adventures of Rex the Wonder Dog #20)

Supporting Character(s)

• Danny Dennis (last appearance in Adventures of Rex the Wonder Dog #19; next appearance in Adventures of Rex the Wonder Dog #20)

Villain(s)

• A mountain lion (no further appearances)

Other Character(s)

• Zena (no further appearances)

Synopsis:
Danny joins the daughter of one of his father's army pals on a hunt for uranium. While searching, an earthquake opens a giant crevase separating Danny and Rex. When Danny and the girl are threatened by a mountain lion, Rex finds a rope to use to cross the gap in the ground. He fights off the lion until Danny can get to safety. Rex then escapes from the lion.