Avengers/Alpha Flight Crossover: Part 1 of 3 - "The Invasion of Atlantis!" Guest-starring the Avengers. Story by Bill Mantlo. Art by David Ross and Whilce Portacio. The undersea tyrant, Attuma, has taken the aquatic heroine, Marrina, captive. Now, to save the life of their estranged teammate, Alpha Flight must unite with the Savage Sub-Mariner and the Mighty Avengers. But can even this assemblage of heroes defeat the entire army of Atlantis?