In Half-Life: Block Shift you play as Blockney Calblox, a security guard at the Block Mesa lab. When the science team's experiment goes wrong and aliens invade, Blockney has to fight his way through the chaos. He helps some scientists fix a teleporter so they can all escape. After a quick trip to the border world Xen to fix the teleporters, it is Blockney's final job to help the scientists and himself to escape Block Mesa