- "My father thinks I am a coward."
"Then he doesn't know you. 'Cause the man I know has dedicated his entire life to making sure what happened on Mars never happens anywhere else. So go in there, J'onn, and show your father who his son really is."
- —J'onn J'onzz and Supergirl
|Eliza throws Alex and Maggie a wedding shower, which causes Maggie to reach out to her estranged father. Supergirl joins J'onn on a personal mission.|
- Melissa Benoist as Kara Danvers/Supergirl
- Mehcad Brooks as James Olsen
- Chyler Leigh as Dr. Alex Danvers
- Jeremy Jordan as Winn Schott
- Katie McGrath (credit only)
- Odette Annable (credit only)
- Chris Wood (credit only)
- David Harewood as Director J'onn J'onzz/Martian Manhunter
Special guest stars
- Sharon Leal as M'gann M'orzz/Miss Martian
- Carl Lumbly as M'yrnn J'onzz
- Carlos Bernard as Sheriff Oscar Rodas
- Dewshane Williams as Till'all
- Louriza Tronco as N'keyy
- Izabela Vidovic as young Kara Zor-El
The scene begins with Kara and Alex discussing games to play at Alex and Maggie's pre-wedding party. There's a thump at the entryway and it's J'onn. He tells the sisters that he's disappearing for a couple of days — he's returning to Mars to help M'gann.
Kara and Alex give talking him a shot of coming back to his home planet, however he's obstinate. In the end he consents to let Kara go with him.
J'onn and Kara stroll into a carport where an exemplary vehicle is sitting, it's J'onn's spaceship. The vehicle turns out of the carport and rapidly transforms into a spaceship, which takes off.
Alex and Maggie are eating with Eliza. Eliza discovers that Maggie doesn't have any youth picture and the last uncovers that she hasn't addressed her folks since she's was 14 — in the wake of coming out, her folks showed her out of the house and left her with her auntie.
J'onn and Kara land on Mars and start researching M'gann's admonition call. They discover M'gann underground with a gathering of individual warriors. She advises them that the White Martians have a Green Martian jail camp, one which his dad is detained.
M'gann says the White Martians accept the J'onns father realizes how to work an incredible weapon they're after — something that would permit them to know the area, and in this way murder, any obstruction contenders.
M'gann and her kindred Resistance contenders disclose to J'onn that he needs to go to his dad and convince him not to support the White Martians.
Alex and Maggie are discussing Maggie's relationship with her folks. Alex inquires as to whether Maggie's at any point had a go at reaching them again and Maggie says she got notification from family members that her mom has expelled all photos of her from any family photograph collection. Alex takes a stab at convincing Maggie to welcome her folks to their wedding and the last simply needs to drop it.
J'onn approaches where his dad is being held hostage. Subsequent to talking, J'onn's dad thinks J'onn is really a White Martian acting like his child — he says his child could never have left Mars to escape to Earth.
Back on Earth, Maggie awakens and chooses to call her dad. She leaves him a voice message to fill him in on a portion of her life refreshes and illuminates him that they're facilitating a wedding shower and welcomes him to come.
When J'onn comes back to M'gann's alcove, the Resistance contenders state if J'onn can't break through to his dad, they won't have any decision yet to execute him.
Maggie discovers her father is going to the wedding party and gets him from the bus station. The two go on a walk and her father reveals to her that she's been staying aware of every last bit of her virus cases records on the web.
J'onn returns to address his dad, who despite everything believes he's a White Martian. J'onn's dad starts discussing the weapon the White Martians need access to.
Back at M'gann's den, one of her Resistance warriors takes her out, saying he's doing it to their benefit. Kara hurries to discover J'onn and the pair, alongside J'onn's dad, start to take a shot at their break plan.
They take M'yrnn back to their previous home, and he gets furious and slaps J'onn.
Alex and Maggie are having their pre-wedding party. Eliza starts to have a random data challenge, with a tanked Winn starting to pose inquiries. Maggie's dad comes in with a jug wine for the prospective love birds. Maggie acquaints her dad with Alex.
Taking a gander at the photos of the couple as children, Maggie's father acknowledges there isn't an image of her on the board. He snaps a photo out of his wallet and pins it to the board.
The couple starts opening presents and as they kiss, Maggie's dad gets noticeably agitated and leaves the gathering and Maggie before long follows and two examine whether the world has changed as far as tolerating homosexuality.
Back on Mars, Kara is conversing with M'yrnn about helping spare his home planet. She discloses to him she comprehends why he wouldn't like to accept that his child is as yet alive and convinces him to allow J'onn to substantiate himself.
J'onn contacts his dad's head and the two remember a memory of J'onn's little girls running all through their home. M'yrnn at long last understands that his child has returned home to spare him. He tells Kara and J'onn what the White Martians are doing with the staff and the gathering races off to stop them.
The gathering unites on the gathering of White Martians utilizing the staff and an enormous battle breaks out. The White Martians start utilizing the staff to radiate a clamor that is rendering the Green Martians and obstruction battles oblivious.
With the assistance of M'yrnn and J'onn's spaceship, Kara can utilize the staff to discard the remainder of the White Martians before giving over the staff to M'gann and the Resistance.
The Resistance chooses to give the staff back to J'onn — they need him to take the staff to Earth to shroud it.
Back on Earth, Maggie discloses to her dad that he gave her the best endowment of all — he caused her to understand that she needn't bother with him to try and like her any longer. She's OK with herself and encompassed by individuals who love and bolster her. She gives him back the infant picture he nailed to the board and strolls off.
Maggie and Alex are looking at getting conclusion and the last insights that it might adjust her perspective on needing kids. Maggie still says that Alex is the main thing she needs, implying that she doesn't need kids.
Kara and J'onn come back to Earth, and it's uncovered that they brought M'yrnn with. J'onn embraces Kara, telling her this was something he could never have had the option to manage without her. Kara welcome M'yrnn to Earth and takes off.
The dad and child begin strolling home.
- This is the first episode of the series to not feature Chris Wood (Mon-El) and Odette Annable (Samantha Arias) after signing on as series regulars. This is also the first episode of the series to not feature Katie McGrath (Lena Luthor) after being promoted to a series regular.
- In Martian mythology, there were two deities mentioned, Phobos and Deimos. These are the names of the two moons that orbit Mars.
- Phobos and Deimos are also gods from Greek mythology. They are Ares' children and charioteers, being the gods of fear and dread, respectively.
- This is the first episode that does not feature the D.E.O..
- The title of this episode is from the saying "The apple doesn't fall from the tree," which refers to child-and-parent similarities.
- As of this episode, Erica Durance and Izabela Vidovic officially replaced Laura Benanti and Malina Weissman on the "Previously on Supergirl" segment due to recasting.
- Kara references the Looney Tunes character Bugs Bunny when she mentions having taken a wrong turn at Albuquerque. Bugs Bunny frequently mentions having mistakenly not made a left turn at the city.
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