The first two actors cast for AMC's Walking Dead spinoff/companion series have been revealed, as well as the working title for the show for the time being - Cobalt.

Frank Dillane and Alycia Debnam Carey.

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Deadline reports that British actor Frank Dillane (Harry Potter and the Half-Blood Prince) and Into the Storm's Alycia Debnam-Carey have joined the spinoff pilot as the "former druggie" son, Nick, and "ambitious" daughter, Ashley, of one of the show's main characters - a female guidance counselor named Nancy.Check out the full list of characters for the spinoff pilot , Cobalt.Cobalt takes place during the same zombie apocalypse depicted on The Walking Dead but in a different location. It revolves around Nancy and a divorced teacher named Sean.

Matt Fowler is a writer for IGN. Follow him on Twitter at @TheMattFowler and Facebook at Facebook.com/Showrenity