Namor, the Sub-Mariner Annual (1991 series) #1

Prince Namor leaves a downtown office building one afternoon after a long and pointless meeting, to head back to his desk at Oracle, Inc. Suddenly, a red-white-and-blue shield zips by, narrowly missing him; he looks up to see the Invaders—Captain America, the original Human Torch, and Spitfire—attacking him. Namor manages to defeat them painlessly and go on his way. He is then accosted by the Thing, Mr. Fantastic and the Human Torch; he eludes them and hops in a cab. The cab is intercepted by the Hulk and Doctor Strange, who challenge him. As the fight between Hulk and Namor is about the get nasty, the conflict is interrupted by Invisible Woman, who accompanies Namor to his offices at Oracle. As they approach his floor, she explains that the meeting and the subsequent confrontations were all designed to delay Namor. Delay him for what? Why, his surprise birthday party!