Marvel released a “Secret Invasion Prologue” digital comic to subscribers only last week. Today, it became available to everyone. Somebody has been replaced by a Skrull. I’ve suspected a lot of people, but I didn’t see this one coming. You can read the prologue here. The main event starts on Wednesday. As usual with our event coverage, all crossovers will be reviewed in story arcs, while the main event gets reviewed by the issue. Additional notes, thoughts and background not in the individual reviews can be found here.