ByMichael Patterson, writer at Creators.co
I Write. Sometimes. Follow me on Twitter: @MichaelP93
Michael Patterson

This article contains major spoilers from Arrow Season 5. Tonight's episode saw Prometheus sink to new lows as he orchestrated the abductions of every Team Arrow member from behind bars at A.R.G.U.S. However, undoubtedly the biggest talking point of the episode was Katie Cassidy's return to the show as the sinister Black Siren.

Cassidy previously portrayed Laurel Lance/Black Canary on the first four seasons of the series until the character was unjustly killed off in Season 4. While Cassidy has appeared as Black Siren before on both The Flash and Arrow, her appearance tonight marks a major turning point — because this time, she's back as a series regular.

As always, the internet had plenty to say about the shocking return. Fans of Laurel/Black Siren rejoiced that Cassidy was back on the show as "Black Siren" became a trending topic on Twitter. Check out the best fan reactions below:

As the show has been plagued with low ratings since Laurel's death, it's no surprise that the creative team opted to bring Katie Cassidy back. While Black Siren may be a lot more evil than her Earth-1 doppelganger, tonight we saw humanity, and it's filled a lot of fans with excitement for a possible redemption arc in Season 6.

No matter what side of the playing field Siren ends up on, it's so good to see her back. Welcome back, Katie!

Are you excited about Katie Cassidy's return as Black Siren? Let us know in the comments below!

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