Thor gains a supporting cast member in his next adventure in Journey into Mystery #84 (July 1962): Jane Nelson (not Foster, yet). Jane is Dr. Donald Blake’s sweet, easily-smitten girl who doesn’t have much to do, keeping in that early 1960s Marvel tradition of very poorly written female characters (looking at you, Sue Storm).
Donald Blake volunteers to help out the unfortunate people of San Diablo, who are fighting against a warlord named “The Executioner”. The Executioner sends some war planes against the ship. Donald sneaks away, turns into Thor, and neatly dispatches them.
Upon arriving in San Diabo, they are attacked with tanks. Once again Thor makes an appearance to show you how it’s done.
Donald Blake / Thor wraps it all up in a bow and eventually he and Jane return home to cast unrequited glances in each other’s direction while Jane makes some comments about how Thor is such a he-man. But anyway, yay for expanding the supporting cast!