In the episode, Jake and Terry help D.C. Parlov, an author of a popular book series called the Skyfire Cycle, to find the person who sends him death threats.
In the cold open, Jake takes advantage of the newly waxed floors from the night shift to slide across the precinct and complete "The Full Bullpen."
Jake (Andy Samberg) finds that a nearby precinct has the case of D.C. Parlov (Fred Melamed), author of the popular Skyfire Cycle book series.
In its original American broadcast, "Skyfire Cycle" was seen by an estimated 2.34 million household viewers and gained a 1.0/3 ratings share among adults aged 18–49, according to Nielsen Media Research.
Club gave the episode an "A" grade and wrote, "So something like Brooklyn Nine-Nine acknowledging that its lovable crew are still on the night shift feels like a big deal, even though it's technically just basic storytelling.
"[3] Allie Pape from Vulture gave the show a 4 star rating out of 5 and wrote, "Sergeant Terry Jeffords is the closest thing the Nine-Nine has to a straight man, so he tends to get shafted in the plot shuffle.
Nonetheless, Terry Crews has proven himself to be one of the most eager-to-please comic actors I've ever seen, and he'll do just about anything for a laugh — from putting live animals on his head to busting through walls to flexing his pecs one at a time.
"[5] Andy Crump of Paste gave the episode a 8.5 and wrote, "'Skyfire Cycle' is no different than 'Chocolate Milk,' or 'The Pontiac Bandit Returns,' except that, again, it features Holt in full bone mode (and later, Parlov, who we catch in the middle of a foursome with three young cosplaying women).