The Walking Dead Season 6: 18 Easter Eggs You Probably Missed
6. Invincible
The Walking Dead may be Robert Kirkman's best-known comic, but it's not his only one. The same year Kirkman and Image Comics launched TWD, they also launched Invincible, which is still running to this day.
Spun-off from Tech Jacket, another Kirkman comic, it focuses on the eponymous superhero. In Season 6, there was a reference to the series in Sam Anderson's bedroom, as he had a number of figures of characters from the comic: Invincible, Allen the Alien, Atom Eve, and Omni-Man.
It's not the first time Kirkman has promoted his other ventures within The Walking Dead, and he was actually making references to Invincible as far back as Season 1, when Carl wore a Science Dog t-shirt.