Kara struggles with the loss of Mon-El after he is forced to leave Earth. When Mon-El returns, he reveals that he has time-traveled to the 31st century and founded the Legion, as well as married Imra Ardeen.
| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S03E01 | Girl of Steel |
October 9, 2017
The CW
|
42 | |
| S03E02 | Triggers |
October 16, 2017
The CW
|
42 | |
| S03E03 | Far From the Tree |
October 23, 2017
The CW
|
42 | |
| S03E04 | The Faithful |
October 30, 2017
The CW
|
42 | |
| S03E05 | Damage |
November 6, 2017
The CW
|
42 | |
| S03E06 | Midvale |
November 13, 2017
The CW
|
42 | |
| S03E07 | Wake Up |
November 20, 2017
The CW
|
42 | |
| S03E08 | Crisis on Earth-X (1) |
November 27, 2017
The CW
|
42 | |
| S03E09 |
Reign
mid-season finale
|
December 4, 2017
The CW
|
42 | |
| S03E10 | Legion of Superheroes |
January 15, 2018
The CW
|
42 | |
| S03E11 | Fort Rozz |
January 22, 2018
The CW
|
42 | |
| S03E12 | For Good |
January 29, 2018
The CW
|
42 | |
| S03E13 | Both Sides Now |
February 5, 2018
The CW
|
42 | |
| S03E14 | Schott Through the Heart |
April 16, 2018
The CW
|
42 | |
| S03E15 | In Search of Lost Time |
April 23, 2018
The CW
|
42 | |
| S03E16 | Of Two Minds |
April 30, 2018
The CW
|
42 | |
| S03E17 | Trinity |
May 7, 2018
The CW
|
42 | |
| S03E18 | Shelter from the Storm |
May 14, 2018
The CW
|
42 | |
| S03E19 | The Fanatical |
May 21, 2018
The CW
|
42 | |
| S03E20 | Dark Side of the Moon |
May 28, 2018
The CW
|
42 | |
| S03E21 | Not Kansas |
June 4, 2018
The CW
|
42 | |
| S03E22 | Make It Reign |
June 11, 2018
The CW
|
42 | |
| S03E23 |
Battles Lost and Won
season finale
|
June 18, 2018
The CW
|
42 |
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