SPOILER WARNING: This episode contains major spoilers for "Rupture," the latest episode of "The Flash."
Just when Central City needs him most, the Flash has disappeared.
In "Rupture," the latest episode of "The Flash," Harrison Wells and the rest of Team Flash attempted to re-create the particle accelerator event, which gave Barry his speed in the first place. However, Wells' experiment didn't go exactly as planned, and Barry appeared to explode as the lightning and the Speed Force struck him.
Fortunately for viewers, the preview for "The Runaway Dinosaur" shows that Barry isn't as dead as Team Flash thinks. It appears as though he either got trapped in the Speed Force or was pushed into an alternate dimension, as he flashes back to his childhood home and an alternate Joe tells him he's trapped there forever.
Additionally, Jesse and Wally managed to break out of the Reverse Flash's safe room just in time for the second particle accelerator event. As they ran through the halls to escape what they believed to be explosion, they both got struck full-on by the Speed Force. The blast knocked both of them out, even as it shook the foundation of STAR Labs and caused a little destruction to Team Flash's headquarters. In the comics, both Wally and Jesse are speedsters in their own rights, so it wouldn't be surprising to see them both take up Barry's mantle in order to save Central City from Zoom. However, it's yet to be seen if or how quickly they develop their speedster abilities.
Henry Allen also made a surprising revelation of his own. When Barry visited him in his cabin in the woods, he expressed surprise upon hearing the name Jay Garrick. He then explained to Barry that his mother's maiden name was Garrick, which may or may not be an important clue about the identity of the man in the iron mask.
Before he stepped into Wells' contraption, Barry also managed to have a heart-to-heart with Iris, who revealed that she may have started to develop romantic feelings for him. However, before they got a chance to really expound on the subject, Barry was called away to help the CCPD deal with the Zoom problem.