Which TV series has George Clooney NOT appeared in?

That's a tricky question! George Clooney is known for his long and successful career in film, but he actually got his start in television.

Here's the thing: it's nearly impossible to list every TV series George Clooney has NOT appeared in, simply because there are thousands upon thousands of TV shows out there.

However, some of the most popular and well-known TV series he's not been in include:

* Game of Thrones

* The Walking Dead

* Stranger Things

* Breaking Bad

* Friends

* Seinfeld

These are just a few examples. To get a better idea of specific shows George Clooney has not been in, you would need to provide more context or specify a particular genre or time period.