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AMC is developing a companion series for smash zombie hit The Walking Dead.

The network said Monday it's in the "initial stages" of developing a spinoff of sorts that it is targeting to air in 2015, and will involve Robert Kirkman, who created the comics series on which Dead is based. No other details were provided.

The network is vulnerable as it bids farewell to other buzzy hits: Breaking Bad will end its storied run Sept. 29, and Mad Men has one more season, set for next year. Newer series such as Low Winter Sun haven't caught on as well as executives have hoped. AMC last week confirmed plans for a Bad spinoff, Better Call Saul, focused on Bob Odenkirk's sleazy lawyer Saul Goodman.

And the latest spinoff is meant to expand and extend the life of Dead, though that show is not ending anytime soon. It's TV's top show among young-adult viewers, on broadcast or cable, and continues to set records.

"Building on the success of the most popular show on television for adults 18-49 is literally a no-brainer," said Charlie Collier, AMC's president and general manager. "We look forward to working with (the Dead team) again as we develop an entirely new story and cast of characters. It's a big world and we can't wait to give fans another unforgettable view of the zombie apocalypse."