See You Yesterday

CJ and Bash attempt to present their project using the time machine just before the end of the school year, hoping for a successful test run. The device malfunctions or yields unusable results, leaving them frustrated and aware that time travel is dangerous. They realize a better plan is needed to achieve their goals without unintended consequences.

In their final science class, Mr. Lockhart challenges CJ and Bash to consider the ethical and philosophical ramifications of time travel. The discussion highlights responsibility, potential harm to others, and the consequences of altering the past. The moment foreshadows the heavy costs of their experiments.

The teens manage a second jump that sends them back 24 hours. They race to use the window of opportunity to change events, hoping to improve their chances at the science expo and scholarships. The success brings new momentum, but also new risks as the timeline begins to unravel more quickly.

With the timeline reset, CJ uses the time jump to prank her ex-boyfriend Jared. The chase escalates and Jared is struck by a car, breaking his arm. Bash calls CJ out for crossing lines, warning that meddling with time can have severe, unforeseen consequences.

The pair nearly encounters their past selves, catching glimpses of where they have already been. The realization that their actions are looping back on them unsettles both of them and heightens the stakes of every subsequent jump. They retreat to the present to reassess their plan.

After Jared confronts Calvin, CJ's older brother and his friend Dennis leave a party. Two men collide with them on the street, drawing police attention. The officers misidentify the group, leading to Calvin's shooting and death, a devastating blow that sets the next jumps in motion.

The community mourns Calvin after his death, and CJ resolves to go back in time again to save him. Bash remains cautious but agrees to try, recognizing that the cost of inaction could be higher than the risk of changing the timeline. The loss deepens CJ's obsession with restoring her family.

For their third jump, they enlist Eduardo and upgrade their bizarrely resilient circuit boards. CJ chooses to warn the convenience store owner to prevent a robbery, while past Sebastian becomes entangled in the loop without fully grasping the timeline. A violent confrontation follows, and past Sebastian is shot.

As CJ pursues past Sebastian out of the store, present-day Sebastian witnesses himself dying on the sidewalk and disappears. The past Sebastian dies in front of CJ, collapsing the familiar timeline and signaling that their interference has caused irreversible damage. CJ is left to grapple with the consequences of altering events.

Determined to fix the tragedies, CJ makes a fourth leap to save both Sebastian and Calvin from the looming police encounter. They reach the others but struggle to convince them of the reality they are facing. The officer who previously killed Calvin arrives, and Calvin sacrifices himself so CJ and Bash can escape.

Back in the present, Sebastian confronts CJ and demands to know how many times she has traveled back. She reveals the fourth attempt was the most recent admission, and that he died during the third jump. He forbids any further trips, warning that the timeline will collapse under continued interference.

Despite Sebastian’s caution, CJ decides to try one more jump on her own, pushing the boundaries of the timeline further. The scene ends with CJ back in time, running alone as the consequences of the loop intensify and the path ahead grows increasingly uncertain.