Comic Title: Fantastic Four Annual #3
Publisher: Marvel (Canam Publishers Sales Corp.)
Address: 625 Madison Avenue, New York, NY
Cover Date: 1965
On Sale Date: July 1, 1965 Copyright Date July 1, 1965
Source: Library of Congress, Pamphlets 1965

Frequency: Annually
Cover Price: $0.25
Page Count: 72
Editor: Stan Lee

Title: "Captives of the Deadly Duo"
Pages: 24

Feature(s):
Fantastic Four

Writer: Stan Lee
Penciller: Jack Kirby
Inker: Dick Ayers

Reprinted From:
Fantastic Four #6 (1962)

Feature Character(s)

• Fantastic Four (last appearance in Fantastic Four #5; next appearance in Fantastic Four #7)
• Mister Fantastic (last appearance in Fantastic Four #5; next appearance in Fantastic Four #7)
• Invisible Girl (last appearance in Fantastic Four #5; next appearance in Fantastic Four #7)
• Thing (last appearance in Fantastic Four #5; next appearance in Fantastic Four #7)
• Human Torch (last appearance in Fantastic Four #5; next appearance in Fantastic Four #7)

Villain(s)

• Doctor Doom (last appearance in Fantastic Four #5; next appearance in Fantastic Four #10)
• Sub-Mariner (last appearance in Fantastic Four #4; next appearance in Fantastic Four #9)

Other Character(s)

• A telegram deliveryman (no further appearances)
• A crowd of spectators (Harry, Pete, Hiram and Matilda named; no further appearances)
• Tommy (a hospitalized boy; no further appearances)

Comments:
Part 2:"When Super-Menaces Unite"
Part 3:"When Friends Fall Out"
Part 4:"Trapped"
Part 5:"The End... or the Beginning?"

This story contains the second mention of "unstable molecules" from which the Fantastic Four's costumes are made. They were first mentioned in Tales to Astonish #35 which was released before this issue.

Synopsis:
Doctor Doom tracks down the Sub-Mariner and proposes an alliance. Namor agrees to the team-up as long as they do not harm Sue Storm. Doom then gives Namor a device to plant inside the Baxter Building. The Sub-Mariner then approaches the Fantastic Four peacefully. While the team decides what to do about Namor, Doom uses his device to lift the Baxter Building into orbit.

Each member of the team tries to reach Doom who is piloting a spacecraft which is magnetically connected to the building. They all fail. Finally the Sub-Mariner succeeds in reaching Doom and taking over the ship. Doom is left on a meteor, while the Baxter Building and all within are returned to Earth. The Sub-Mariner and the Fantastic Four reach an uneasy truce, as Namor returns to the sea.