He doesn't appear in THE MARRISSA GAMES; the principal's office is occupied by Alexander at the time, and therefore he doesn't play a role in the story.
He briefly appears in ITS MY LIFE!. He comments that he was fighting "the bad guys from half life" (likely to be the Combine, as it is said that the events of Portal and Portal 2 coincide with the Combine invasion of the Earth and the subsequent rebellion, but no details about them is given, as per Marrissa's unfamiliarity with any Half-Life games) when he was lured into the scene of Marrissa Roberts fighting Assirram, via an explosion. He successfully hits Assirram with his trademark crowbar and kills some zombies, but is dropped to Andord Hell by Assirram, where zombies tear him apart. In despair, his wife "Alex What Ever" (presumably Alyx Vance) sewisides with a katana.