Cause and Effect
The Flash Season 3



Critic Ratings: 9
Critics Consensus

"Cause and Effect" skillfully balances ominous foreshadowing with light-hearted romance in an episode rich with needed backstory.

Episode Info

Barry takes drastic measures to stop Savitar. Meanwhile, H.R. continues to push Tracy Brand to design the trap for Savitar; and Killer Frost returns with an interesting proposal.


Grant Gustin
as Barry Allen/The Flash
Candice Patton
as Iris West
Danielle Panabaker
as Caitlin Snow/Killer Frost
Carlos Valdes
as Cisco Ramon
Jesse L. Martin
as Det. Joe West
Tom Cavanagh
as Harrison Wells
Anne Dudek
as Tracy Brand
Show More Cast

Cause and Effect Videos

Cause and Effect Photos

Critic Reviews for Cause and Effect

The subtle foreshadowing game was on point.

Aug 2, 2018 | Full Review…

Such a breath of fresh air... It's no coincidence that the best Flash episodes this season have been the ones to fight back against the darkness and focus more on lighthearted comedy.

Aug 2, 2018 | Rating: 9.3/10 | Full Review…

But leave it to The Flash to hold on to a few surprises.

Jul 31, 2018 | Full Review…

We learned a whole lot about Savitar's origin this week, but it's still insanely confusing.

Jul 30, 2018 | Full Review…

It's a very meta episode, and I'm not talking about metahumans.

Jul 25, 2018 | Rating: B+ | Full Review…

As much as I love witnessing Barry and Iris fall in love all over again, I also want to understand more about who she is on her own.

Aug 1, 2018 | Rating: 4/5 | Full Review…

The amnesic Barry Allen was funny, I'll give the writers credit for that.

Jul 30, 2018 | Rating: 3/5 | Full Review…

I loved that HR and Tracy kissed in this episode. I found their entire flirty subplot incredibly charming.

Jul 26, 2018 | Rating: B+ | Full Review…

Where it's at right now feels like a necessary retrospective on both the recent darkness as well as the show's initial whimsical nature.

Jul 25, 2018 | Full Review…