Codes
Enter the following codes in the section of introducing cheat codes to the extra content menu:
Swampfire, Gwen, Kevin, Ben – All combos.
Ben, Swampfire, Gwen, Big Chill – Infinite aliens.
Kevin, Big Chill, Swampfire, Kevin – Invincibility.
Gwen, Kevin, Big Chill, Gwen – Lord level.