He is best known for his roles in the films Thor (2011), Star Trek Into Darkness (2013) and Dumbo (2019), and the television series Banshee and Game of Thrones.

Gatt has also provided motion capture for multiple video games, including the God of War series.

Gatt was born in the Notting Hill area of London on 3 December 1971, the son of Maltese immigrant parents; his father is from Paola and his mother is from Lija.

He has performed in many musicals in London's West End and in national tours.

[3] In February 2024, the Los Angeles Deputy District Attorney dismissed all charges against Gatt[6][7] stemming from an arrest in April 2022 for allegedly having sexually explicit chats with a minor online.