It's the End of the World, Didn't You Get the Memo?
Doctor Katherine McKinney was never one for superstitions, and never was her brother Malachy, but they never knew that their uncle was preparing for the end, keeping a bunker of survival gear beneath the house. It mattered for a number of months after the outbreak, when the bunker was compromised and their uncle's death, Katherine had to go on a search to find her brother's unit in Fort Benning.
It's day 297, two months after Malachy and Katherine lost their group to walkers, they are settled in a church two miles from where Rick's group are travelling, only for Carl Grimes to stumble into the woods and be crowded with walkers, forcing the McKinney siblings to take action and then disappearing without a thought.
Rick and Daryl take action to find them, wanting to express their thanks, and question if they could work together to find a new haven.
Doctor Katherine-March McKinney is the younger sister of Malachy McKinney and the love interest of Daryl Dixon.
Sargent Malachy McKinney is the older brother of Katherine-March McKinney and is a potential love interest of Carol Peletier.
Previously a dog owned by a man in a cabin in the woods and found by Katherine three days after his owner killed himself. Soda is a more than loyal friend to Katherine, trusting her quickly and follows all of her commands