The Millennium Codex was a device created by Ashley Chapel, once right-hand man to Tobias Vaughn. It was a nefarious program, created from leftover Cyberman technology, which itself led to the creation of a computer virus that became known as the Codex. When activated, the program would warp reality as if by magic in an attempt to harness the power of Saraquazel, an ethereal sentient power from another universe, which was fated to exist after the destruction of the current one.