Alfred Thomas Highmore (born 14 February 1992) is an English actor. He is known for his starring roles beginning as a child, in the films Finding Neverland (2004), Charlie and the Chocolate Factory (2005), August Rush (2007), and The Spiderwick Chronicles (2008). He won two consecutive Critics' Choice Movie Awards for Best Young Performer. Highmore starred as Norman Bates in the drama-thriller series Bates Motel (2013–2017), for which he was nominated three times for the Critics' Choice Television Award for Best Actor in a Drama Series and won a People's Choice Award. In 2017, Highmore began producing and starring as Dr. Shaun Murphy in the ABC drama series The Good Doctor, for which he was nominated for the Golden Globe Award for Best Actor.

Freddie Highmore plays as Shaun Murphy in Leonardo.
Freddie Highmore is the top #1 member of the cast and appears in 106 episodes.

Matilda De Angelis is an actress.

Matilda De Angelis plays as Caterina da Cremona in Leonardo.
Matilda De Angelis is the top #2 member of the cast and appears in 8 episodes.

Aidan Turner (born 19 June 1983) is an Irish actor. He played the roles of Ross Poldark in the 2015–2019 BBC adaptation of The Poldark Novels by Winston Graham, Dante Gabriel Rossetti in Desperate Romantics, Ruairí McGowan in The Clinic, and John Mitchell in the supernatural drama series Being Human. He played Kíli in The Hobbit film series. Description above from the Wikipedia article Aidan Turner, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Aidan Turner plays as Joe O'Loughlin in Leonardo.
Aidan Turner is the top #3 member of the cast and appears in 5 episodes.