Professor X - Xavier Protocols

The Xavier Protocols are a set of doomsday plans created by Professor X. The Protocols detail the best way to kill many powerful mutant characters, including the X-Men and Xavier himself, should they become too large a danger. The Xavier Protocols are first mentioned during the "Onslaught" crossover and first seen in Excalibur #100 in Moira MacTaggert's lab. Charles Xavier compiled a list of the Earth's most powerful mutants and plans on how to defeat them if they become a threat to the world. They are first used after Onslaught grows too powerful. Only parts of the actual Protocols are ever shown. In the "Operation: Zero Tolerance" crossover Bastion obtains an encrypted copy of the Protocols, intending to use them against the X-Men. However, Cable infiltrates the X-Mansion and secures all encrypted files before Bastion has a chance to decrypt them. Due to the tampering of Bastion and his Sentinels, the X-Mansion computer system Cerebro gains autonomy and seeks to destroy the X-Men by employing its knowledge of the Xavier Protocols. In a virtual environment created by Professor X Cerebro executes the Xavier Protocols against the X-Men.

Each Protocol is activated by the presence of a different combination of X-Men and were written by Xavier himself:

Code 0-0-0 (Charles Xavier): This file is both an entry on Charles Xavier, as well as an introduction to the Xavier Protocols. It contained a holographic image of Charles Xavier, reading the following message: "Moira, Scott, Jean; if you three are seeing these images, then I have become a mortal threat to my X-Men. In this instance, I must be stopped by any means necessary. Some years ago, I made a study of various forms of possible defense against my own psychic abilities. The image next to me is that of an anti-psionic armor. The wearer should be protected from my talent. When I finish speaking, a blueprint for this armor will be downloaded." (Activated by Moira MacTaggert, Cyclops, and Jean Grey)