The Avengers Vol. 1 (1963-1996) #155

Plot

Earth's Mightiest Heroes have gone down to defeat at the hands of Doctor Doom! And now the shield-slinger, the golden avenger, the Vision, the Scarlet Witch, the Wasp, and Yellowjacket are prisoners of the Latverian monarch on Hydrobase! Meanwhile, Wonder Man, the Beast, and Robert Frank search for Attuma...and find him at an underwater U.S. research laboratory! In the middle of the furious battle, the Sub-Mariner arrives...and mistakenly attacks the Whizzer and Wonder Man! Everything is going Attuma's way! Can anyone stop the Atlantean madman? (mycomicshop.com)