Avengers #272 1986

Avengers #272, published by Marvel in October 1986, features "Assault on Atlantis," the first part of a crossover with Alpha Flight. The Avengers and Alpha Flight invade Atlantis to rescue Marrina from Attuma. Namor leads the charge to save Marrina, an extraterrestrial he loves. Following her rescue, Marrina's monstrous transformation causes her to flee, prompting Namor to leave the Avengers to pursue her. This issue is notable as part of the "Avengers Under Siege" storyline and marks Namor's first resignation from the team.