The author was convinced to return to the universe by fellow writer Joe Hill.
I do have this one idea for a novella.
I pitched himDay Zeroand he said, ‘That’s your next book.'"

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“The big deal was announced and nobody had told Harlan,” says Cargill.
He seems kind of pissed.'"
Although the film was never made, the pair became friendly.

Harper Voyager
“He was such a wonderful, wonderful man.
I love Harlan’s story.
It’s no coincidence thatDay Zerohints atA Boy and His Dog.”
Cargill reveals that he would like to return again to his world of killer robots.
“I have some ideas that are percolating right now,” he says.
“I have really grown fond of writing in that world and playing with those characters.
There’s other stuff that I’d like to do there.”