Season 3 of the Freeform's mermaid mystery-thriller series, Siren, was extended on May 14, 2019, with it's official premiere on April 2, 2020, and it premiered on April 2, 2020 and concluded on May 28, 2020.
Ben's shocking decision to let the reporter die at the end of season two has ripple effects in his relationship with Maddie and Ryn. Meanwhile, a dangerous, sophisticated new mermaid arrives in Bristol Cove, challenging Ryn's leadership and igniting an epic undersea battle between rival tribes. All of this is complicated by the fact that Ryn's baby, now being carried by a surrogate, must be protected at all costs.
- On August 14, 2019, it was announced that Tiffany Lonsdale would join the Siren cast as a series regular.
- On January 17, 2020, a premiere date was announced; Season 3 would receive a two-episode premiere on Thursday, April 2 at 10pm/9c.
|1||"Borders"||Eric Wald||Joe Menendez||April 2, 2020|
|As an old friend visits Helen, a new mermaid arrives leaving Ryn questioning their motives. Maddie learns the truth behind Ian's death, as Ben fights for his mother's treatments. While Xander is inspired to take on more responsibility.|
|2||"Revelations"||Emily Whitesell||Nick Copus||April 2, 2020|
|When another mysterious death is uncovered in Bristol Cove, Ryn suspects Tia. Maddie befriends a new acquaintance in Seattle. Helen warns the hybrids of trouble. Xander begins training and Ted revisits the past|
|3||"Survivor"||Sarah Wise||Aprill Winney||April 9, 2020|
|Ryn seeks help only to learn the secret existence of her unborn child. Ben sets out on a dangerous path to help his mom, while Xander tries to establish himself in his new career. Helen consults with Eliza to help contact Sarge.|
|4||"Life and Death"||Michael Gans
|Joe Menendez||April 16, 2020|
|Ben and Maddie help Ryn guide her surrogate though a life-threatening delivery. Helen and Xander deliver a hybrid corpse to Beth at Caspian Ranch. Xander faces danger on the high seas during a ride-along with the Bristol Cove water patrol.|
|5||"Mommy and Me"||Liz Maccie||John Badham||April 23, 2020|
|Ryn returns to land to explore human motherhood. Maddie and Robb come across a gruesome discovery. Ben experiences mysterious side effects and Ted confronts Helen.|
|6||"The Island"||Gavin Johannsen||Amanda Row||April 30, 2020|
|Ryn discovers a refuge of injured mermaids that escaped Tia's violent takeover. Ben and Xander get caught in a battle with Tia's troops. Maddie feeds Robb half-truths to secure his discretion. Ted explores his family lineage.|
|7||"Northern Exposure"||Gavin Johannsen||Marita Grabriak||May 7, 2020|
|Ryn, Ben, Maddie must recruit new allies in the fight against Tia. Helen seeks answers when she's haunted by Donna's spirit. Tia obtains dangerous weapons she plans to use in her fight. Xander struggles to make amends with Annie.|
|8||"Til Death Do Us Part"||Heather Thomason||Bola Ogun||May 14, 2020|
|Ryn, Ben and Maddie must protect Bristol Cove from Tia's army. Meanwhile, Ben's injections are producing unexpected results, which alarms both him and the others. Xander juggles best man duties at Calvin's wedding while also helping Helen.|
|9||"A Voice in the Dark"||Zoe Green||Steven A. Adelson||May 21, 2020|
|Tia unleashes a deadly attack on Bristol Cove. Ryn, Ben and Maddie race against time to find a cure for Xander's mysterious illness, while anticipating Tia's next move. Baby Hope returns to land to reconnect with Ryn.|
|10||"The Toll of the Sea"||Eric Wald
|Joe Menendez||May 28, 2020|
|In an effort to save Hope, Ryn and Ben confront Tia in an undersea battle between the mermaid tribes. Maddie and Robb work to find a cure for Xander, while Helen and the hybrids help restore order. Ted struggles to accept Ben's reality.|
- Deadline — "‘Siren’ Canceled By Freeform After 3 Seasons" (August 5, 2020)
- Deadline — "‘Siren’: Tiffany Lonsdale Set As New Series Regular For Season 3 Of Freeform Series (August 14, 2019)
- Deadline — "‘Siren’ Gets Season 3 Premiere Date At Freeform; First-Look Photo – TCA" (January 17, 2020)