Watch Supergirl Online: Season 4 Episode 9

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Was it really the end of the line for John Deegan? 

On Supergirl Season 4 Episode 9, Supergirl, The Flash, and Arrow returned to Star City, and realized they would need to go to another Earth if they wanted to take down the villain once and for all. 

Meanwhile, Felicity questioned whether she should have noticed that there was something off with Oliver, and someone had the best answer. 

Also, Barry and Oliver questioned whether each should keep their new abilities, or give them back. 

Use the video above to watch Supergirl online right here via TV Fanatic. 

Catch up on all your favorite shows and reviews and join in the conversations with other fanatics who love TV as much as you.

Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.

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Supergirl Season 4 Episode 9 Quotes

Barry Allen: You can't just write yourself as a hero. It doesn't work that way.
Deegan as Dark Superman: Doesn't it, though? You were struck by lightning, I was given the book by a higher power. Both random acts of chance. This is my destiny so much more than becoming The Flash was ever yours.
Barry Allen: People don't become heroes because of circumstance. They become heroes in spite of circumstance.
Oliver Queen: You're just a cheap knockoff.

Kara: You're a monster.
Deegan as Dark Superman: No, I'm Superman.