It is the middle of summer, and all the Mr. Men and Little Misses are on holiday, except for Mr. Grumble and Mr. Worry. But Mr. Worry is too worried to stay alone. So he decides to seek comfort with Mr. Grumble, which isn't a good idea at all, since Mr. Grumble hates surprise visits. Poor Mr. Worry will have a hard time making himself welcome to such a discourteous host!
- This is the only episode not to feature any female characters, Jill Shilling didn't appear to voice any of them.