Comic Title: Secret Origins #43
Publisher: DC (DC Comics Inc.)
Address: 666 Fifth Avenue, New York, NY
Cover Date: August 1989
On Sale Date: June 20, 1989 Shipping Date June 20, 1989
Source: Previews, #4

Shipping Date June 20, 1989
Source: Amazing Heroes, #167

Direct Market Date June 22, 1989
Source: Comic Shop News, #102, #104

Copyright Date June 30, 1989
Source: Library of Congress, Copyright Office 1989

Frequency: Monthly
Cover Price: $1.50
Page Count: 48
Editor: Mark Waid

Title: "Adventures Inside Earth"
Pages: 10

Writer: Bob Wayne
Artist: Timothy Truman
Letterer: Timothy Harkins
Colorist: Helen Vesik

Reprinted In:
Time Masters TPB (2008)

Feature Character(s)

• Cave Carson (first post-Crisis appearance; next appearance in Time Masters #1)

Supporting Character(s)

• Bulldozer Smith (first post-Crisis appearance; no further appearances)
• Christie Madison (first post-Crisis appearance; no further appearances)
• Johnny Blake (first post-Crisis appearance; no further appearances)
• Lena (first post-Crisis appearance; no further appearances)

Villain(s)

• Various Nazis (no further appearances)

Cameo Appearance(s)

• Adolf Hitler (during an attempted time travel experiment)

Comments:
This story is narrated by Johnny Blake.

Synopsis:
Researcher Cave Carson helped to invent a thermo-ray and design a digging machine which could tunnel inside the Earth. However, his research was shut down in the late 1950s after his company turned their attention to outer space research. Carson stole the plans to the digging machine and the thermo-ray. He built the Mighty Mole and put together his own team to explore the world underground. His team consisted of Christie Madison, Bulldozer Smith, and later Johnny Blake.

The team had several adventures inside the Earth, but they eventually ran out of funding. On their last excursion, they encountered a secret underground Nazi lab where the Nazis were experimenting with time travel. Carson's arrival interrupted the plan to bring Hitler into the future. After defeating the Nazis, Carson uses the Nazi gold to continue funding his explorations. The time travel equipment was turned over to Carson's original company in exchange for letting Carson keep the inventions that he stole.