He offered Herbert and Argyle shelter during the summer of 2248. However, due to an incident with Crag's daughter, Herbert and Argyle were exiled from Rockopolis. He invited them back, but they were exiled shortly after because they led the slavers to Rockopolis. Crag ordered the citizens to kill them and Herbert barely managed to escape alive, but Argyle died.
Crag is mentioned in Fallout 3 but does not appear in the game.