Uncanny X-Men / Fantastic Four '98

In this 1998 one-shot from Marvel, writer Joe Casey and artists Leo Fernández and Paul Pelletier bring together two of the publisher's most iconic teams for a self-contained crossover. The story explores the inevitable tension that arises when Charles Xavier's mutant students cross paths with Reed Richards' super-powered family, each group operating under very different philosophies. It's a brisk, character-driven encounter that captures the distinct voices of both the X-Men and the Fantastic Four during the late 1990s.