Captain America and his Howling Commandos discover Hydra's underwater base where a monstrous secret is hidden, while Thor, Sif, and Loki seek to rescue the captured Fandral.

Cover title. "Contains material originally published in magazine form as Marvel's The Avengers: The Avengers Initiative #1, Captain America & Thor!: Avengers #1 and Tales of Suspense #64"--P. [1].

Assemble! / writer, Fred van Lente ; artist, Ron Lim -- Citadel of spires / writer, Fred van Lente ; penciler, Ron Lim -- Hawkeye and the new Black Widow strike again! / writer, Stan Lee ; penciler, Don Heck.