He appeared in "End of Days", the first series finale of Torchwood, as a medical doctor dealing with cases of the Black Death.
From 2007, he played the lead character of gangster Lyn Edwards in the Welsh-language television series Y Pris, dubbed "'The Sopranos' by the sea".
[5] Gravelle starred in the 2010 film Patagonia and then in the BBC Wales series Baker Boys as Rob, the co-manager of Valley Bara and the fiancée of Sarah (Eve Myles).
In 2013, he was cast in the hit ITV crime drama Broadchurch as Joe Miller, husband of Olivia Colman's character.
[6] Later that year he guest-starred in the Welsh detective drama Y Gwyll, in which his real-life wife Mali Harries stars.