Amelia May Alcock (born 11 April 2000) is an Australian actress. She received an AACTA Award nomination for her performance in the Foxtel comedy-drama Upright (2019–2022). She gained wider recognition for starring as young Rhaenyra Targaryen in the HBO fantasy series House of the Dragon (2022–2024). Alcock is best known for portraying Kara Zor-El / Supergirl in the DC Universe, first making an uncredited appearance in Superman (2025). She reprised the role starring in Supergirl (2026).

Milly Alcock

Acting Born April 11, 2000 Sydney, New South Wales, Australia

Amelia May Alcock (born 11 April 2000) is an Australian actress. She received an AACTA Award nomination for her performance in the Foxtel comedy-drama Upright (2019–2022). She gained wider recognition for starring as young Rhaenyra Targaryen in the HBO fantasy series House of the Dragon (2022–2024). Alcock is best known for portraying Kara Zor-El / Supergirl in the DC Universe, first making an uncredited appearance in Superman (2025). She reprised the role starring in Supergirl (2026).

Known For

The Tonight Show Starring Jimmy Fallon

Self - Guest

House of the Dragon

Young Rhaenyra Targaryen

Supergirl

Supergirl

Superman

Supergirl (uncredited)

Last Meals

Self

House of the Dragon: The House That Dragons Built

Self

A Place to Call Home

Emma Carvolth

Sirens

Simone DeWitt

Wonderland

Teen Girl 1

Upright

Meg Adams

Man of Tomorrow

Supergirl

The Gloaming

Jenny McGinty