Garfield was a comic strip.
In 1981, Peri Brown read the Garfield cartoons which were posted on Bob Salmon's door. (PROSE: Blue Box)
In 1997, Sarah Jane Smith looked for a magazine which had a Garfield strip while waiting in Pimms Shipping's reception area. (PROSE: Bullet Time)
When the Twelfth Doctor was in The Prison, he found I Hate Mondays by Garfield in the library made of "unwanted ballast" books from Old Earth. He took the book and quipped "Always got to love a book by a cat". (PROSE: The Blood Cell)
Behind the scenes
Bill Murray voiced Garfield in the two live-action films released in 2004 and 2006. The second film also featured Richard E Grant among the voice cast, while Lucy Davis and Jane Carr appeared in live-action roles.