SPOILER WARNING: This article contains major spoilers for "Finish Line," the Season 3 finale of The Flash.
Savitar is dead, but the Speed Force isn't quite done with Barry Allen. In "Finish Line," the Season 3 finale of The Flash, Barry freed Jay Garrick, thereby emptying the Speed Force prison he created for Savitar. However, this prison requires a new occupant -- and Barry just offered himself up as its latest victim.
Earlier in the season, The Flash revealed that a future version of Barry Allen created the Speed Force prison with a little help from scientist Tracy Brand in an effort to defeat Savitar. This prison has one requirement: it must always have a prisoner. In the mid-season finale, Savitar tricked Wally into becoming his replacement; later, Jay took Wally's place, so that Barry could save his brother. So, in freeing Jay from this prison, it was left empty... and the Speed Force came calling on Central City, demanding a new prisoner.
As Central City loomed on the edge of destruction, Barry knew what he needed to do and volunteered himself to take Jay's place in the Speed Force prison. As the episode drew to a close, he said goodbye to each member of Team Flash, told Wally to watch over Central City as its hero and asked that Earth-2's Harry Wells stick around to take HR's place on the team. Shortly thereafter, a portal opened and the Speed Force manifested as Barry's mother Nora, who invited him to go with her. He took her hand and they walked into the Speed Force together, only for them to vanish from sight.
Immediately after they disappeared, the Speed Force storm winked out of existence, leaving Team Flash looking grim. The episode closed on a shot of a devastated Iris, who sobbed as she realized that she lost Barry to the Speed Force, just moments after he delivered Save the Date cards for their upcoming wedding. Of course, since this is the Season 3 finale, we'll have to wait until the fall to see how Team Flash and Central City manage without the Scarlet Speedster.
Starring Grant Gustin as the Scarlet Speedster, The Flash will return for Season 4 on The CW this fall. The series also stars Jesse L. Martin, Tom Cavanagh, Carlos Valdes, Candice Patton, Danielle Panabaker, Keiynan Lonsdale and more.