During a creative writing unit at Longfellow School, the students in Mrs. Brisbane's class practice using their imagination with their very own writing journals--and Humphrey finds out that writing from his imagination is harder than it looks.

When an accident at the lab sends them back in time to the stone age, Tom, a janitor, and Dr. Morice, a scientist, must work together to face down cavemen, saber-tooth tigers, and other B.C. hazards in a novel that doubles as an introduction to the basics of creative writing.

At their local comic book store, the kids make a startling discovery: they’ve read every last issue of their favorite comic, Z-Man, and no new issues are coming...ever! (Thanks a lot, apocalypse.). Nooo! Our heroes have but one choice: continue Z-Man’s legacy by writing and illustrating THEIR OWN COMIC BOOK! Step one? Knock off their beloved Z-Man and cast themselves as super rad, super goofy, superhero protectors of the mysterious city of Apocalyptia....