LOS ANGELES — Marvel’s first family has finally found box office gold. “The Fantastic Four: First Steps,” the first film about the superheroes made under the guidance of Kevin Feige and the Walt Disney Co., earned $118 million in its first weekend in 4,125 North American theaters, according to studio estimates Sunday.

Marvel goes back to its origins, gulping the fresh air of Stan Lee and Jack Kirby’s first hit comic The Fantastic Four in 1961. Ignoring recent flop film versions, it revels in a self-contained, space-age world as yet uncluttered with other costumed characters,