Comic Title: Legion of Super-Heroes #4
Publisher: DC (DC Comics Inc.)
Address: 666 Fifth Avenue, New York, NY
Cover Date: February 1990
On Sale Date: December 12, 1989 Shipping Date December 12, 1989
Source: Amazing Heroes, #174

Shipping Date December 12, 1989
Source: Previews, #10

Shipping Date December 14, 1989
Source: Advance Comics, #12

Direct Market Date December 14, 1989
Source: Comic Shop News, #128, #129

Copyright Date December 12, 1989
Source: Library of Congress, Copyright Office 1989

Frequency: Monthly
Cover Price: $1.75
Page Count: 32
Editor: Mark Waid

Title: (No Title)
Pages: 24

Feature(s):
Legion of Super-Heroes (Post-Crisis)

Plotter/Penciller: Keith Giffen
Scripter: Tom Bierbaum
Scripter: Mary Bierbaum
Inker: Alan Gordon
Letterer: Todd Klein
Colorist: Tom J. McCraw

Reprinted In:
Legion of Super-Heroes:Five Years Later Omnibus Vol. 1 HC (2020)

Feature Character(s)

• Legion of Super-Heroes (last appearance in Legion of Super-Heroes #3; next appearance in Legion of Super-Heroes #6)
• Mon-El (last appearance in Legion of Super-Heroes #3; no further appearances)
• Shadow Lass (last appearance in Legion of Super-Heroes #61; no further appearances)
• Brainiac 5 (last appearance in Legion of Super-Heroes #3; next appearance in Legion of Super-Heroes #10)

Villain(s)

• Time Trapper (dies in this story; last appearance in Legion of Super-Heroes #3; no further appearances)

Other Character(s)

• Grev (Tasmia's brother; no further appearances)
• Brainiac 5's assistant (no further appearances)
• Eltro Gand (last appearance in Legion of Super-Heroes #3; no further appearances)

Cameo Appearance(s)

• Superboy (in flashback)
• R. J. Brande (in flashback)
• Lightning Lad (in flashback)
• Saturn Girl (in flashback)

Comments:
The death of the Time Trapper at the conclusion of this story causes a change to the entire history of the DC Universe.

Synopsis:
Mon-El has been resurrected. After awakening on Shanghalla, Mon-El seeks out Shadow Lass on Talok VIII. She has been mourning Mon-El for five years and is thrilled to have him back. However, her husband delivers news of a threat from the Time Trapper.

Mon-El and Shadow Lass seek out Brainiac 5. He discovers evidence that the Time Trapper's brain waves are present in Mon-El's body along with a third pattern belonging to Eltro Gand, who once sacrificed his life to revive Mon-El. As Brainiac 5 prepares to separate the Time Trapper's essence from Mon-El's body, the Time Trapper manipulates Brainy's servant to attack. Mon-El disappears during the confusion.

Mon-El and the Time Trapper then face off directly. The Time Trapper explains that he created the Pocket Universe from which both Mon-El and Superboy were created. He did so to influence the creation of the Legion in an attempt to prevent Mordru from dominating the universe for a millennium. His plan worked too well, as the Legion one day rose to not only stop Mordru, but to be a threat to the Time Trapper himself.

The Time Trapper explains that if Mon-El succeeds in destroying him, his work will be undone. The Trapper will never exist, the Pocket Universe and thus the Legion will never come to be. Despite the history altering ramifications, Mon-El delivers the final blow to destroy the Time Trapper.