In the small town of Vernon, on October 27, 29, and 31, 1987, three teenage girls named Tiffany Clark, Marisa Song, and Heather Hernandez were killed by the Sweet 16 Killer, each having been stabbed 16 times on the nights of their 16th birthdays.

In the present day of 2023, teenager Jamie Hughes goes to a concert with her friend Amelia on Halloween night while her mother, Pam, stays at home.

Using the trauma to bond with Pam, she infiltrates their group and convinces them to leave for the weekend, although this backfires; they end up at the cabin where Marisa was killed in the original timeline.

On Halloween night, the group reconvenes at the amusement park while Lauren works on turning a popular attraction into a makeshift time machine for Jamie to travel forward.

In May 2022, Amazon Studios and Blumhouse Television announced Totally Killer which is being directed by Nahnatchka Khan and written by Jen D'Angelo and David Matalon and Sasha Perl-Raver.

"[11] Michael Nordine of Variety wrote, "In trying to break the tension with humor, too many horror movies undercut their emotional stakes by instead being glib, a pitfall Totally Killer mostly manages to avoid.

"[13] Tatat Bunnag of the Bangkok Post said that director Nahnatchka Khan "successfully captures the vibrant atmosphere and fluorescent colours of the 80s, while also deftly highlighting the problematic attitudes and behaviours of that era when viewed through today's lens.

"[15] Benjamin Lee of The Guardian gave the film 2 out of 5 stars, writing, "Its time-travel slasher plot cribs elements from all and relies on enthusiasm over invention to keep us entertained, a gamble that only works in brief bursts.

"[16] The New York Times' Brandon Yu wrote, "Its '80s throwback setting is short on color and life, and its slasher elements lack the choreographic or cinematic oomph to induce any terror, or even tension.