|Film Appearance?||Yes (as Coach Malone)|
Mr. Underwood is Greg's Physical Education teacher. He has a very little role in the first book, teaching the students a wrestling unit. His role in The Last Straw was a minor but important appearance, where he was walking with the principal Mrs. Mancy to mark the students' dancing abilities as 20% of their P.E. grades. In Cabin Fever, he was also shown during a push-up test. In The Third Wheel, he is shown being bitten by Ruby Bird. In the film, he is known as Coach Malone.
- Diary of a Wimpy Kid Online (First online appearance)
- Diary of a Wimpy Kid (First book appearance)
- Diary of a Wimpy Kid: The Last Straw
- Diary of a Wimpy Kid: Cabin Fever
- Diary of a Wimpy Kid:The Third Wheel
- Diary of a Wimpy Kid (film)
- Diary of a Wimpy Kid: Rodrick Rules (film)
- Diary of a Wimpy Kid: Dog Days (film)
- In the film, he is known as Coach Malone.
- He could be retired, as he hasn't appeared in a book since The Third Wheel.
- He rarely smiles, like Greg.