Secret Invasion: X-Men #1

The opening issue of this 2008 four-part Marvel limited series drops readers right into the Skrull invasion as it collides with mutantkind — the cover by Terry and Rachel Dodson says it all. Emma Frost and a dark-costumed female mutant stand their ground in the foreground, fists raised, while a hulking Skrull warrior and a Wolverine-like figure in armored gear loom menacingly behind them. Writer Mike Carey and artist Cary Nord take the reins for what promises to be a tense, action-charged showdown between the X-Men and Earth's shape-shifting invaders.