Who Stars in Freeform's 'Siren'? Meet The Full Cast!

Sibongile Mlambo as Donna

Donna is the second mermaid who comes to the surface, who might be even more mysterious and dangerous than Ryn.

You’ll recognize Sibongile from her role as Tamora Monroe on MTV’s Teen Wolf. She’s a Zimbabwean–South African actress and her name means “we are thankful” in Zulu.