Resident Evil 6 story trailer

In Resident Evil 6 each of the characters in the game has his own story (and partner), but at certain key points their tales will intersect and allow for moments of four-player co-op. When you play through Leon's story for example, you may bump into Chris and his partner Piers Nivans, or Jake and Sherry Birkin. When you play each of their campaigns, you'll see how and why they came to be in the same place at the same time. This “Crossover” gameplay helps tie the whole story together and leads to some amazing setpieces.