Craig is a character in the NerdCubed comic. The first time Nathaniel met Craig, on the USS Plan B, he was a half creeper. The second time he was a normal human. He is Allan's younger brother. He sneaked off to the far future and stole technology he used to build the library.
Craig downloaded Nathaniel's consciousness from the Library which led to Nathaniel having to sacrifice him, with the help of Sir Truffleton, in order to get his own body back.
After an incident with the root, where it only half transformed Craig into a player-creeper creature, Craig was kept in his high security bedroom on the USS Plan B.