 In " The Last Voyage " , Elite Special Operations Commander Rtas ' Vadumee and his team respond to a distress call and board the crippled supply craft Infinite Succor , which the Covenant believe has been attacked by humans . The only crew member still alive , a Covenant Prophet , tells ' Vadumee that the Succor has been infested by the Flood , which escaped Halo on a Covenant dropship and crash landed in the Succor 's hangar . Currently stuck on the ship , the parasite intends to activate the Succor 's slipspace drive to escape the star system and find new planets to infect . Fighting waves of Flood , including the reanimated remains of his fallen soldiers , ' Vadumee plots a slipspace course that will destroy both the Succor and the Flood , then escapes via a Covenant shuttle . 
