The Central City has always been threatened by different individuals, but it's a good thing that there are meta-human heroes like Barry Allen/The Flash (Grant Gustin) who are willing to risk everything to save everyone. In "The Flash" season 4 episode 15, titled "Enter Flashtime," Earth-1's resident speedster will be joined by Jesse Quick (Violette Beane) and Jay Garrick (John Wesley Shipp) in order to stop a nuclear attack on Central City.

"The Flash" season 4 episode 15 will feature the reunion of the speedster trio, Barry, Jesse Quick and Jay Garrick. Unfortunately, there will be not much time for the three to bond as they will try to stop a nuclear bomb from exploding in Central City. The return of Barry's fellow speedsters from alternate Earth dimensions is very much needed, as all of them must use their powers to slow down time via Flashtime, wherein all citizens of Central City are frozen.

The motives behind the mysterious woman's plan to obliterate the city are still uncertain, and without Jesse and Jay's help, everyone would have already died in an instant. Barry is shown to be crying and desperate, as he tells his wife Iris West-Allen (Candice Patton) that he could do nothing to stop the bomb. Even with the help of Cisco (Carlos Valdes), Barry still fails to stop the nuclear bomb's detonation.

Barry, Jay and Jesse will use Flashtime as an opportunity to foil the plans in detonating the nuclear bomb. Based on the promo for "The Flash" season 4 episode 15, the three must push themselves to the breaking point to make sure than no one in Central City will perish from the time-sensitive threat. 

Jesse Quick was last seen in "The Flash" season 4 episode 3 as a hologram, in which a breakup cube was needed to be delivered to Wally (Keiynan Lonsdale). Meanwhile, Jay was last featured in the season 3 finale as he joined forces with Team Flash to defeat Savitar.

"The Flash" season 4 episode 15 will air on Tuesday, March 6, at 8 p.m. EST on The CW.