![Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--sgfuDCd4--/c_fill,h_315,w_851/d_tv-fanatic-placeholder-square.png,f_auto,fl_lossy,q_75/v1446061736/banner/supergirl.jpg)
Supergirl
Tuesdays 9:00 PM on The CWWatch Supergirl Season 4 Online
Watch Supergirl Season 4 full episodes online, free and paid options via our partners and affiliates.
![Lillian and Lena Are Summoned - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--J_xcnNNR--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1557974693/lillian-and-lena-are-summoned-supergirl.jpg)
On Supergirl Season 4 Episode 22, Supergirl realizes she has one last chance to stop Lex as she turns to the power of the press to help her.
![An Unlikely Source - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--gUrWvVfh--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1557623467/an-unlikely-source-supergirl.jpg)
On Supergirl Season 4 Episode 21, Kara comes face to face with Red Daughter and the two engage in an epic battle, and Lena turns to Lillian Luthor for help.
![Tessmacher Sets a Trap - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--PPBpnd7c--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1557008514/tessmacher-sets-a-trap-supergirl.jpg)
On Supergirl Season 4 Episode 20, when Kara and Lena try to hunt down Lex, Eve Tessmacher sets a trap that could ultimately reveal that Kara is Supergirl.
![Drastic Measures - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--OnksofoW--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1556243524/drastic-measures-supergirl.jpg)
On Supergirl Season 4 Episode 19, Kara doggedly works as a reporter to clear Supergirl's name as Dreamer picks up the slack as National City's protector.
![Lena Looks For Clues - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--4N_mQ99a--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1555809892/lena-looks-for-clues-supergirl.jpg)
On Supergirl Season 4 Episode 18, Kara and Lena head to Stryker's Island to find clues to defeat Lex, while Lena studies an array of puzzles Lex left behind.
![The Aftermath - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--A3aZimxZ--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1553994549/the-aftermath-supergirl.jpg)
On Supergirl Season 4 Episode 17, Supergirl faces her biggest challenge yet as she must deal with the destructive aftermath of Lex's nefarious plans.
![Lex Luthor's Next Plan - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--h6Zq2cqg--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1553484994/lex-luthors-next-plan-supergirl.jpg)
On Supergirl Season 4 Episode 16, Lex Luthor reveals all about his daring plan to rid the world of Supergirl, but how far will he go to win the battle?
![Kara and Alex Hug It Out - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--U7gdmI34--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1552570038/kara-and-alex-hug-it-out-supergirl.jpg)
On Supergirl Season 4 Episode 15, Lex Luthor gets a furlough from prison due to ill health, but what is the villain's master plan to take down a hero?
![Worried For Everyone's Safety - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--8QXVr25H--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1552176131/worried-for-everyones-safety-supergirl.jpg)
On Supergirl Season 4 Episode 14, with Ben Lockwood's push to stir up the anti-alien movement, Supergirl is worried about the safety of both humans and aliens.
![Catching Manchester Black - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s---JZyk7Ok--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1551412151/catching-manchester-black-supergirl.jpg)
On Supergirl Season 4 Episode 13, Supergirl pulls double duty as she tries to apprehend Manchester Black and his team and deal with a shocking new development.
![Looking For a Distraction - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--XpadmVdr--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1550368457/looking-for-a-distraction-supergirl.jpg)
On Supergirl Season 4 Episode 12, Kara decides to team up with J'onn on his latest P.I. assignment but it ends up tying directly into Alex's current situation.
![Embrace Her Destiny - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--KlmRfH7T--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1547950157/embrace-her-destiny-supergirl.jpg)
On Supergirl Season 4 Episode 11, Nia is encouraged to embrace her destiny and Alex deals with a drug that turns people violent and gives them superpowers.
![Colonel Haley - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--i6EDtSjv--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1547949883/colonel-haley-supergirl.jpg)
On Supergirl Season 4 Episode 10, Colonel Haley and Supergirl clash when she handles a distress call from a Navy ship that turns out to be an alien attack.
![Cheers! - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--G8zK4u5h--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1542814901/cheers-supergirl.jpg)
On Supergirl Season 4 Episode 9, the Elseworlds crossover continues, and Cisco continues to cause problems for his former friends. Can anyone get through to him?
![Persuading Nia - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--q2kJYGc---/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1543710084/persuading-nia-supergirl.jpg)
On Supergirl Season 4 Episode 8, Kara and Brainy try to persuade Nia to embrace her destiny after she has a powerful dream about Agent Liberty.
![Following a Lead - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--hc2xMLxF--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1543105720/following-a-lead-supergirl.jpg)
On Supergirl Season 4 Episode 7, Supergirl and Manchester Black track down a lead on Agent Liberty's location when things end up taking a dark turn.
![Alex Danvers - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--dEzU1rns--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1542381851/alex-danvers-supergirl.jpg)
On Supergirl Season 4 Episode 6, the characters meet up for Thanksgiving, but Kara is struggling after her conversation with Ben Lockwood on national tV.
![Kara's Article - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--wNwhVX34--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1541902194/karas-article-supergirl.jpg)
On Supergirl Season 4 Episode 5, Kara writes s series of articles highlighting aliens in National City but inadvertently ends up putting them in harm's way.
![Rethinking His Decision - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--Pw-M5wzq--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1541289677/rethinking-his-decision-supergirl.jpg)
On Supergirl Season 4 Episode 4, Alex asks Lena and Brainiac to team up to help Supergirl while J'onn questions his decision to quit the DEO.
![The Turning of Ben Lockwood - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--1bcBmHPa--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1540664285/the-turning-of-ben-lockwood-supergirl.jpg)
On Supergirl Season 4 Episode 3, Ben transforms from a mild-mannered professor into the villainous Agent Liberty with input from his anti-alien father.
![On a Mission - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--Jn3LhgBd--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1539901631/on-a-mission-supergirl.jpg)
On Supergirl Season 4 Episode 2, a shocking revelation causes chaos in National City and Supergirl heads off in an attempt to capture Mercy Graves.
![Called Into Action - Supergirl](https://tv-fanatic-res.cloudinary.com/iu/s--nV94zuOz--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1539453156/called-into-action-supergirl.jpg)
On Supergirl Season 4 Episode 1 Alex and Brainy try to get in sync, James faces an indictment for the vigilante Guardian, and Supergirl is called into action.