Warning! Spoiler warning! UPDATE 4/1/18 9:44 PM ET: The Walking Dead's mystery helicopter returned, linking itself to a shocking character!

SPOILERS for The Walking Dead season 8, episode 14 ahead!. SPOILER ALERT: Do not keep reading if you have not seen Episode 5 of Season 9 of “The Walking Dead,” titled “What Comes After”. SPOILERS for The Walking Dead season 9, episode 3 ahead!. Warning! Tonight's Walking Dead finally confirms a long-running theory - the cryptic "A" seen tagged on everything from train cars to shipping containers has a meaning, and it's connected to that mystery helicopter..