General Immortus launches his attack against the Doom Patrol right in the heart of their home base, the Shelter! Caught off guard, the team must stop the general’s army from killing all of the metahumans they’ve sworn to protect. Fortunately, they won’t have to do it alone, as the all-new Flex Force rises to help them! But is this the real threat or merely a diversion? Only Immortus knows for sure!