Happy Death Day 2U is a 2019 American science fiction black comedy slasher film written and directed by Christopher Landon.

A sequel to Happy Death Day (2017), it stars Jessica Rothe, Israel Broussard, Suraj Sharma, and Steve Zissis.

Ryan resumes work on an experimental quantum reactor with fellow students Samar and Dre to slow down time.

After Dean Bronson shuts down the project for causing several power outages and not producing practical applications so far, Ryan is murdered by someone dressed as school mascot Babyface and wakes up again on the 19th.

That night, Tree goes to the hospital to intercept serial killer John Tombs before he escapes, but she is confronted by a police officer.

Waking at the beginning of her loop, Tree demands that Ryan and his team help her escape it, requiring they test dozens of algorithms.

Tree hides from the killer in a hotel, but that evening, the news reports that Carter died trying to save Lori at the hospital.

She advises Lori to end her affair with her professor Gregory Butler, discovers that Danielle is cheating on Carter, and has a final conversation with her mom.

Later, Tree, Carter, Ryan, Samar, and Dre are escorted by agents to a DARPA laboratory, where the reactor has been moved for further experimentation.

[10] Actress Jessica Rothe in an interview in 2018 stated that while most horror sequels retread the original, Landon's pitch instead "elevates the movie from being a horror movie into a Back to the Future type of genre film where the sequel joins us right from where we left off, it explains a lot of things in the first one that didn't get explained, and it elevates everything.

All tracks are written by Bear McCrearyOn January 2, 2019, Back Lot Music released a cover of "Stayin' Alive" performed by Lizzo as a stand-alone promotional single for the movie.

[18] However, the film was rescheduled after a request from Fred Guttenberg, whose daughter, Jaime was a victim of the Stoneman Douglas High School shooting, which took place exactly one year prior.

[1] In the United States and Canada, Happy Death Day 2U was released alongside Isn't It Romantic, and was projected to gross $17–20 million from 3,207 theaters in its opening weekend.

The website's critical consensus reads, "A funnier follow-up with a sci-fi bent, Happy Death Day 2U isn't as fiendishly fresh as its predecessor, but fans of the original may still find this a sequel worth celebrating.

[25] Kimber Myers, writing for the Los Angeles Times, said: "Happy Death Day 2U can't quite replicate the feelings of joy and discovery of the original, but Landon deserves credit for varying the tune, while still playing the hits that will please the fans of its predecessor.

[37] In 2020, Blum said that while other studios would have cancelled a follow-up to Happy Death Day 2U following its financial underperformance, a third movie "is still on my radar in some shape or form".

[39] In September 2020, Landon confirmed a third film, tentatively titled Happy Death Day to Us, was in active development, with Rothe reprising her role.