Collects Miles Morales: Spider-Man (2018) #16-21. Itβs Moraleses vs. monsters as the Ultimatum saga reaches its chaotic conclusion! Miles is taking on his biggest responsibility yet: babysitting his new little sister, Billie! But fussiness and feeding time are the least of their problems, because thereβs something horrific stirring underground! Meanwhile, Milesβ uncle Aaron has made a deal with a different kind of monster β the villainous Ultimatum β and heβs about to get bitten! And to make things worse, when the government outlaws teenage super heroes, life must change for Brooklynβs young Spider-Man! Itβs time for the next generation to stand together β or fall apart! But will Milesβ greatest enemy beβ¦himself? Ultimatumβs master plan is in motion, and itβs way bigger than anyone expects. Everyone in Milesβ orbit β and beyond β will need to come together to win this battle!