You may know that Robert Kirkman created the Image comic books Invincible and The Walking Dead. You might not know that Invincible has cameoed as Easter eggs in multiple episodes. (The franchises have crossed over in other ways: Walking Dead alum Steven Yeun voices Mike Grayson, a.k.a. the superhero Invincible, in Amazon's adult animated series adaptation. More Walking Dead cast members have since loaned their voices to the series, including Lauren Cohan and Michael Cudlitz.) And on Sunday's episode of The Walking Dead, titled "A New Deal," an Invincible comic cameo had deeper meaning for the Grimes family.