Lizzie and Mika Samuels are fictional characters from the fourth and fifth season of the AMC television series The Walking Dead portrayed by Brighton Sharbino and Kyla Kenedy, based on The Walking Dead comic book characters Billy and Ben, gender-swapped in-adaptation. Introduced in the fourth season premiere, Lizzie and Mika are two young siblings, and the daughters of Ryan Samuels. Following the death of their father, Carol agrees to raise the girls as her own children. The struggles of Lizzie and Mika are contrasted within the series as Lizzie, capable of taking a human life, is unable to kill walkers, instead believing she can communicate with them and have an emotional connection. Conversely, Lizzie's younger sister, Mika, willingly kills walkers, but her compassion for others prevents her from taking the life of another human being.

The fourth season of The Walking Dead, an American post-apocalyptic horror television series on AMC, premiered on October 13, 2013, and concluded on March 30, 2014, consisting of 16 episodes. Developed for television by Frank Darabont, the series is based on the eponymous series of comic books by Robert Kirkman, Tony Moore, and Charlie Adlard. It was executive produced by Kirkman, David Alpert, Scott M. Gimple, Greg Nicotero, Tom Luse, and Gale Anne Hurd, with Gimple assuming the role of showrunner after Glen Mazzara's departure from the series. The fourth season was well received by critics. It was nominated for multiple awards and won three, including Best Syndicated/Cable Television Series for the second consecutive year, at the 40th Saturn Awards.