Robert Kirkman is known for creating the original Walking Dead comics, as well as titles like Invincible, on which he's still involved in the adaptation on Amazon Prime. Kirkman was initially involved in AMC's The Walking Dead and established much of the television universe's world. With multiple Walking Dead spin-offs now ongoing following the original show's ending, Kirkman's influence is still at the root of it all.
The Walking Dead Creator Robert Kirkman Regrets Doing The CDC Episode So Early
The CDC Scenes Were Too Pivotal For The Walking Dead's Sixth Episode
The Walking Dead season 1 is compact, with its primary role being to establish the world and the initial batch of characters, particularly Rick Grimes. The season 1 finale, "TS-19," takes a dramatic turn, with the characters arriving at the CDC (Center for Disease Control) in Atlanta, only to find Dr. Edwin Jenner as its sole survivor. After making a horrifying discovery that everyone in The Walking Dead was already infected, he attempts to kill the main characters, along with himself.
"TS-19" Doesn't Feel Like A Typical The Walking Dead Episode And Reveals Too Much
The Walking Dead Excels In Its Feeling Of Isolation & Mystery
The Walking Dead is responsible for hundreds of television episodes, as well as spin-off video games and more. By now, there's plenty of information available about this world and how it works, but Robert Kirkman initially sought to leave many aspects ambiguous. "TS-19" has some fantastic dramatic moments, particularly for the survivors audiences already know, but it could be argued that it's atypical in how much exposition the audience and characters are given.
The events of The Walking Dead affect the entire world, yet it's written to feel isolated, which effectively amplifies the fear factor and allows it to focus on character dynamics and themes like grief.

For Better Or Worse, "TS-19" Changed The Course Of The Walking Dead
The Walking Dead's Stakes Were Never The Same
The effects of "TS-19" have drastic implications on the rest of the franchise, impacting The Walking Dead as soon as its second season. After Shane's death, he immediately comes back as a walker, forcing Rick to reveal what he knew from Dr. Jenner. Rick possesses pivotal information that few people in this world have, and that drastically affects how he and every character he shares it with will operate for the remainder of their time.