Comic Title: Challengers of the Unknown #81
Publisher: DC (DC Comics Inc.)
Address: 75 Rockefeller Plaza, New York, NY
Cover Date: Jun/Jul 1977
On Sale Date: March 22, 1977 Newsstand Date March 22, 1977
Source: DC Coming Attractions, #4

Newsstand Date March 22, 1977
Source: Comic Reader, #141

Copyright Date March 22, 1977
Source: Library of Congress, Periodicals 1977

Newsstand Date March 21, 1977
Source: Daily Planet, Vol. 77 #11
Listed as on sale the week of March 21st

Newsstand Date March 24, 1977
Source: House Ad, Super-Team Family #10, Page 25

Shipping Date March 1, 1977
Source: DC Coming Attractions, #4

Frequency: Bi-monthly
Cover Price: $0.35
Page Count: 32
Editor: Jack C. Harris

Title: "Multi-Man's Master Plan"
Pages: 17

Feature(s):
Challengers of the Unknown (of Earth-1)

Writer: Gerry Conway
Penciller: Michael Netzer
Inker: Bob Wiacek

Reprinted In:
Swamp Thing:The Bronze Age Vol. 2 TPB (2020)

Feature Character(s)

• Challengers of the Unknown (last appearance in Super-Team Family #10; next appearance in Challengers of the Unknown #82)
• Ace Morgan (last appearance in Super-Team Family #10; next appearance in Challengers of the Unknown #82)
• Red Ryan (last appearance in Super-Team Family #10; next appearance in Challengers of the Unknown #82)
• Rocky Davis (last appearance in Super-Team Family #10; next appearance in Challengers of the Unknown #82)
• Prof. Haley (last appearance in Super-Team Family #10; next appearance in Challengers of the Unknown #82)

Supporting Character(s)

• June Robbins (last appearance in Super-Team Family #10; next appearance in Challengers of the Unknown #82)
• F. Gaylord Clayburn III (last name misspelled Clayborne twice in this story; last appearance in Super-Team Family #10; next appearance in Challengers of the Unknown #82)

Villain(s)

• Multi-Man (last appearance in Super-Team Family #10; next appearance in Challengers of the Unknown #84)
• Heathcliff Monroe (a doctor; first appearance; next appearance in Challengers of the Unknown #82)
• M'Nagalah (last appearance in Swamp Thing #8; next appearance in Challengers of the Unknown #82)
• Residents of Perdition (last appearance in Swamp Thing #8; next appearance in Challengers of the Unknown #82)

Other Character(s)

• Susan Charness (no further appearances)
• An unnamed army colonel (no further appearances)

Comments:
The spelling of Clayburn's last name is given as both Clayburne and Clayborne in this story.

Perdition is incorrectly identified as being in Massachusetts in this story. This is corrected in Challengers of the Unknown #82 which places the town in Pennsylvania.

This story is continued from Super-Team Family #10 and continues in part in Challengers of the Unknown #82.

Synopsis:
The Challengers split up to find Multi-Man. Prof. traces electrical signals to an underwater dome where June is held captive. While the others head to California where Multi-Man has constructed a force field surrounding a secret nuclear plant. Red penetrates the force field and battles his opponent alone. However, Multi-Man teleports away.

Red regroups with Rocky and Ace. They head to Denver where Multi-Man has fled. Rocky battles the villain alone. At the same time Prof. is completing his rescue of June and manages to destroy a device which is providing Multi-Man with power. Without his powers, Multi-Man is defeated.

The Challengers return to their mountain headquarters where it is revealed that Prof. is dying. Clayburne claims he has found a doctor who can help, Heathcliff Monroe from the town of Perdition.