Tommy, Chuckie, and Angelica wile away a long, tedious car trip by pretending to be astronauts on their way to the moon.

When the babies bet Angelica that she cannot be nice for an entire day, they run into trouble when Angelica is too nice to handle some playground bullies.

When their parents take the babies to the mall to see Santa, Chuckie is scared even before Angelica puts her own frightening spin on the tradition, but when she

Tommy's world is turned inside out forever by the appearance of a new playmate in the form of what he is told to expect will be a new baby sister.