T Rex and his best friend, Walter, have been looking forward to their play date, but when they get too rambunctious and everything is going wrong, Mama knows how to make things right.

Mama Rex has plans for a fun afternoon with T until she learns that he has a diorama about pigs due tomorrow, and so it's off to the library, the museum, and the park to gather information and supplies.

T Rex stays up late and helps his mother with her work by making a special folder.