Cheryl successfully melts the comet, but the resulting energy blast thrusts the entire town back to 1955 . The characters are teenagers again, with Jughead Jones as the only one who remembers their previous lives. Critical & Fan Reception
Analysts at Den of Geek noted that the 1950s jump allowed the show to return to its Archie Comics roots for its final season, effectively "rebooting" the entire series.
Veronica uses her "human dialysis" ability to absorb the powers of her friends and transfers them to Cheryl through a kiss, boosting Cheryl’s Phoenix powers enough to destroy the comet.