Comic Title: Superman's Pal Jimmy Olsen #12
Publisher: DC (National Comics Publications, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: April 1956
Approx. On Sale Date: February 28, 1956 Copyright Date February 26, 1956
Source: Library of Congress, Periodicals 1956
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: Monthly, with the exception of January, May, July and November
Cover Price: $0.10
Page Count: 32
Editor: Mort Weisinger

Title: "The Secret of Dinosaur Island"
Pages: 8

Feature(s):
Jimmy Olsen (of Earth-1)

Writer: Otto Binder
Penciller: Curt Swan
Inker: Ray Burnley

Reprinted In:
Showcase Presents:Superman Family Vol. 1 TPB (2006)

Feature Character(s)

• Jimmy Olsen (last appearance in Superman's Pal Jimmy Olsen #12; next appearance in Superman's Pal Jimmy Olsen #12)

Supporting Character(s)

• Superman (last appearance in Superman's Pal Jimmy Olsen #12; next appearance in Superman's Pal Jimmy Olsen #12)

Other Character(s)

• Professor William March and a robot sentry (no further appearances)

Synopsis:
Jimmy and Clark visit Mystic Island where several large creatures have been spotted. The island is inhabited by dinosaurs, brought back to life after being frozen in ice. Professor March, who restored the dinosaurs, has created a robot sentry to protect the island and prevent anyone from getting proof of the dinosaurs.

While Jimmy explores the island, Clark stays behind in the helicopter because the island has a large concentration of Kryptonite on it. Clark then replaces the robot, shielded by its lead armor to prevent Jimmy from getting photos.

Professor March learns Clark's secret identity, but agrees to keep it secret if he helps hide the island. Clark agrees, using his powers to make the island even more difficult to locate. March is dying, so Clark's secret will be safe. Jimmy returns to the mainland without any evidence that dinosaurs exist.