The story continues the adventures of the creature Gizmo, who spawns numerous small monsters when wet. In the first film, Gizmo's offspring rampaged through a small fictional town. In Gremlins 2: The New Batch, Gizmo multiplies within a skyscraper in New York City. The new creatures thus pose a serious threat to the city should they be able to leave the building, and much of the story involves the human characters' efforts to prevent this disaster. It is the sequel to the 1984 film Gremlins.

References:
https://en.wikipedia.org/wiki/Gremlins_2:_The_New_Batch