Riley Finn's role as a double-agent in the series will be more closely explored in the comic.
"You'll see exactly what he's up to and with whom he is up to it," Espenson told CBR.
"I love mixing things up, getting to play in different genres. Buffy Season Eight has allowed me huge freedom to write different kinds of stories.
"It's not so much that I was thirsty to write spy-type action, but that I was hungry for that variety. And the spy action did turn out to be a blast. It's really well-suited to the demands of this kind of writing, where the visual is so important."
Buffy the Vampire Slayer Season Eight: Riley will be illustrated by Karl Moline and released in August.