The survivors are guided by a mysterious "Voice" over the intercom and work with a lifeguard named to find supplies and a way to reach the mainland. Their journey spans several diverse locations:
Ryder attempts to flee with the vaccine and his zombified wife. dead-island-definitive-edition
The wife bites him, and Ryder injects himself with the vaccine, which instead causes him to mutate into a powerful monster. The survivors are guided by a mysterious "Voice"