Mr. Watson

Mr. Watson is a teacher of Greg who appeared in The Last Straw. Greg once fell asleep on his class and he punished him, but Greg slept in his punishment chair, but didn't wake up on time and woke in Mrs. Lowry's class where he got his first detention as a punishment.

Online
In the online version, he was called Mr. Peters and he used to have Rodrick in his class and also Frank which explained that he is old. He plays the same role.

Trivia

 * According to Greg Mr.Watson's age could possibly be around 100 years old which is an exaggeration.