MORALESES VS. MONSTERS! Miles is taking on his biggest responsibility yet--babysitting his new little sister, Billie Morales! But fussiness and feeding are the least of their problems--there's SOMETHING UNDERGROUND! Meanwhile Miles' uncle Aaron made a deal with a different kind of beast--ULTIMATUM--and he's about to get bit.

MORALESES VS. MONSTERS! Miles is taking on his biggest responsibility yet--babysitting his new little sister, Billie Morales! But fussiness and feeding are the least of their problems--there's SOMETHING UNDERGROUND! Meanwhile Miles' uncle Aaron made a deal with a different kind of beast--ULTIMATUM--and he's about to get bit.