The Lady and Rex have a baseball game against the Big City Brats. Jack is not allowed to swing the bat, so he is told to be the Bat Boy. That is, until the Lady Town Ladies and the Big City Brats are tied. It's up to Jack to hit a home run, but on the way to home plate he spots some snacks...

When the Lady is mad at Jack, she decides to send him and Rex on a one-way trip into outer space, and while she enjoys some peace and quiet, Jack and Rex get into trouble on a far-off moon, where they meet an alien named Zip.

From bestselling author Mac Barnett and Geisel Award-winning illustrator Greg Pizzoli, an uproarious early reader series about a mischievous rabbit, a cranky old lady, and a lovable dog. Jack, Rex, and the Lady visit the zoo. But when Jack gets hungry, he sneaks into a koala's cage to steal some snacks. In a case of mistaken identity, the Lady takes the koala home and leaves Jack stuck in the cage. How will Jack escape, and will the Lady and Rex be...

"The Lady gives Jack a gift. It's a lab kit! Jack goes into the shed to experiment and doesn't come out until he's made another Jack and another Jack and another. But one Jack was already too many. Can Jack stop his naughty robot clones before they destroy the town?"--Provided by publisher.