Roe co-starred with Timothée Chalamet in the coming-of-age film Hot Summer Nights, which premiered at the South by Southwest festival in March 2017, and was released the next year. Roe played one of the lead roles, Evan Walker, in the 2016 science fiction film The 5th Wave, followed with a starring role as Holt Anthony in the 2017 horror film Rings. He relocated to Los Angeles and worked in a number of Hollywood films. In 2014, Roe landed his first television role in the United States and played the male lead as Luke Holt in ABC Family's tennis drama film Unstrung.

In 2011, Roe appeared in guest appearances in episodes of Holby City as Connor Lane, Doctors as Matt Goonan, Hollyoaks as Toby, and The Jury as Schoolboy. In 2010, Roe played Elliott Baden, a popular competitive swimmer in BBC Two's teen drama The Cut. After appearing in this production in 2009, he began to land more acting roles. Jennifer Saunders saw him performing in a school production of Our Country's Good and asked him to audition for her comedy Jam & Jerusalem. Roe also played the lead role of Jay Keaton in CITV's 2005 children's science fiction series The Fugitives. He made his acting debut in 2000 in the horror film The Calling when he was 10 years old. Roe first appeared in an advertisement for Milky Way as a child. He continued playing football after he relocated to Los Angeles, where he plays for an amateur team Atlético Silverlake. While he was acting on network television, he was also playing for a Hayes Middlesex Sunday league football team Chiswick Albion in 2010.

After he returned to school in England and before his acting career took off, he played semi-professional football with Chalfont St Peter. He joined a Division Two football club when he was 16, and then played in Spain for a year.

He enjoys sports especially association football playing as a striker. He won a sixth-form scholarship to Latymer Upper School in Hammersmith where he studied until 2009.

His father worked as a plumber and his mother was a ballet dancer. He has a twin sister, Katheryne Elizabeth. Roe was born in London, and grew up in Ladbroke Grove. He has also played major roles in a number of films, including Hot Summer Nights, Rings and Forever My Girl. He is best known for playing Jay Keaton in the series The Fugitives, Elliott Baden in The Cut and Benjamin Pownall in Siren. Alexander Michael Roe-Brown is a British actor.

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