After a wild day of mishaps leaves Clifford wishing he wasn't so big, Emily Elizabeth reads Clifford Gulliver's Travels as he drifts off to sleep. He dreams he is a little dog, and is at first excited to be able to do all the things he couldn't before...until Emily Elizabeth needs help...BIG HELP! When he wakes up, he is glad to be back to his big, regular size!/There is a new mail carrier on Birdwell Island! Emily Elizabeth, Clifford and the gang help Mrs. Clayton deliver invitations to everyone in town by way of their very own Big Red Delivery Service. After almost all the invitations are handed out, they realize they almost forgot to give the guest of honor his invitation! But where will they find him? Maybe at...the post office?