- April 3, 2020
Siren Season 3 Episode 1 Borders
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.
- April 3, 2020
Siren Season 3 Episode 2 Revelations
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.
- April 9, 2020
Siren Season 3 Episode 3 Survivor
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.
- April 17, 2020
Siren Season 3 Episode 4 Life and Death
Ben and Maddie help Ryn guide her surrogate though a life-threatening delivery. Helen and Xander deliver a hybrid corpse to Beth at The Ranch. Xander faces danger on the high seas during a ride-along with the Bristol Cove water patrol.
- April 24, 2020
Siren Season 3 Episode 5 Mommy and Me
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.
- May 1, 2020
Siren Season 3 Episode 6 The Island
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.
- May 8, 2020
Siren Season 3 Episode 7 Northern Exposure
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.
- May 15, 2020
Siren Season 3 Episode 8 'Til Death Do Us Part
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.
- May 22, 2020
Siren Season 3 Episode 9 A Voice in the Dark
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.
- May 29, 2020
Siren Season 3 Episode 10 The Toll of the Sea
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.