8 p.m. on KTLA-5
The Season 6 premiere, “Into the Void,” picks up the story scant moments after Nora was erased from the timeline, so Barry and Iris (Grant Gustin, Candice Patton) are struck speechless by their grief. Meanwhile, the rest of their team braces to take on their biggest threat yet, one that could destroy all of Central City. Elsewhere, Killer Frost (Danielle Panabaker) has a harrowing brush with death that has a profound effect on her relationship with Caitlin.
Ryan Eggold stars in “New Amsterdam” on NBC.