X-Men + Fantastic Four : 4X

A French prestige one-shot from Panini, 4X imagines a single-issue team-up between Marvel's two flagship families—the X-Men and the Fantastic Four—published in 2020. While the series is defined by this crossover premise, its brevity (just one issue) means it serves more as a snapshot of the era's interest in combining mutant and cosmic dynamics than a sustained narrative. The talent involved is not specified, but the concept itself highlights the perennial appeal of seeing these iconic groups interact.