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Supergirl S3E17 — Trinity
7.5
Supergirl•Season 3•Episode 17

Trinity

7.5/10 · 1,628 votesMay 7, 201842 min

Ranked #9 of 23 in Season 3•matches the season avg

Discussion

Still reeling after learning about Lena’s secret, Supergirl asks Guardian for a favor that could alter his relationship with Lena forever. Meanwhile, with all three Worldkillers united, Supergirl and the team brace for an epic battle.

Directed byErica Weiss, Caitlin Parrish
Previous episodeE16 · Of Two MindsNext episodeE18 · Shelter from the Storm
BestEpisodes
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Seasons6

All123456

Season 3 Episodes23

Girl of Steel stillE1 7.6

Girl of Steel

Triggers stillE2 7.2

Triggers

Far From the Tree stillE3 7.2

Far From the Tree

The Faithful stillE4 7.4

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Damage stillE5 7.4

Damage

Midvale stillE6 8.1

Midvale

Wake Up stillE7 7.6

Wake Up

Crisis on Earth-X (I) stillE8 8.8

Crisis on Earth-X (I)

Reign stillE9 8.5

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Legion of Superheroes stillE10 7.7

Legion of Superheroes

Fort Rozz stillE11 7.5

Fort Rozz

For Good stillE12 7.2

For Good

Both Sides Now stillE13 7.2

Both Sides Now

Schott Through the Heart stillE14 7.0

Schott Through the Heart

In Search of Lost Time stillE15 7.5

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Of Two Minds stillE16 7.4

Of Two Minds

Trinity stillE17 7.5Now viewing

Trinity

Shelter from the Storm stillE18 7.5

Shelter from the Storm

The Fanatical stillE19 6.9

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Dark Side of the Moon stillE20 7.3

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Not Kansas stillE21 6.4

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Make It Reign stillE22 7.3

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Battles Lost and Won stillE23 7.5

Battles Lost and Won

Cast8

Melissa Benoist

Melissa Benoist

Kara Danvers / Supergirl / Kara Zor-El

Chyler Leigh

Chyler Leigh

Alex Danvers / Sentinel

David Harewood

David Harewood

J'onn J'onzz / Martian Manhunter

Katie McGrath

Katie McGrath

Lena Luthor

Odette Annable

Odette Annable

Samantha Arias / Reign

Chris Wood

Chris Wood

Mon-El

Jeremy Jordan

Jeremy Jordan

Winn Schott

Mehcad Brooks

Mehcad Brooks

Jimmy Olsen / Guardian

Crew6

D

Derek Simon

Teleplay

C

Caitlin Parrish

Teleplay

Jessica Queller

Jessica Queller

Story

E

Erica Weiss

Director

C

Caitlin Parrish

Director

M

Matt Villeneuve

Assistant Location Manager

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Episode Summary

"Trinity" is episode 17 of Supergirl season 3. It scored 7.5/10 from 1,628 votes, ranking #9 of 23 episodes this season (season average 7.5). Directed by Erica Weiss, Caitlin Parrish, it aired on May 7, 2018.

Next: E18 · Shelter from the StormBest of Season 3