Avengers (1963 1st Series) #301

 "Super-Nova Unbound!" Part 1 of 3. Plot by Mark Gruenwald. Script by Ralph Macchio. Art by Bob Hall (layouts) and Don Heck (finishes). Cover by Bob Hall and Don Heck.

A new era for Earth's Mightiest Heroes begins by moving Hydro-Base into New York Harbor, so the Avengers' headquarters will be closer to the big city! But shortly after the relocation, a former avenger sends a distress call to the new team!