Determined to learn what the Whos seem so excited about, The Grinch decides to take a vacation, but after being irritated by the snowy mountains, the sandy beaches, and the loud theme park, his dog Max does not let The Grinch give up.
When Milo's uncle and Tilly's grandfather are poisoned by a mysterious copy of The Wizard of Oz and fall into a deep sleep, Milo and Tilly travel to the Emard City to find out who is behind the poisoning.
