Roberts' big break came in 1998, when she appeared in Solomon a Gaenor opposite Ioan Gruffudd.
With dialogue in Welsh and Yiddish, the movie won Best Film at the 2000 Verona Film Festival and was nominated for Best Foreign Language Film at the 72nd Academy Awards.
Her subsequent Welsh-language credits include Fondue, Rhyw a Deinosors!, Newes of the Weeke, Y Palmant Aur, Glan Hafren, the long-running soap opera Pobol y Cwm, and S4C's gangster drama Y Pris.
Roberts' English-language television credits include the comedy series Dr.
Terrible's House of Horrible, the drama Border Café, and several single-episode appearances in prime-time British shows such as The Bill and Casualty.
Roberts has starred in two films directed by her husband, Marc Evans: Snow Cake (2006), a drama focused on the friendship between a high-functioning autistic woman and a man who is traumatized after a fatal car accident; and Patagonia (2009), a drama set in Y Wladfa, Argentina.
In 2009, Roberts also starred as registrar Mary Finch in Crash!, a hospital drama commissioned by BBC Wales and produced by Tony Jordan.
In 2010, Roberts guest-starred in the two-part Doctor Who Series 5 episode The Hungry Earth/Cold Blood.
More big-screen productions followed: She appeared in Hattie Dalton's Third Star (2010) and in Vertigo Films' The Facility (2012), an atmospheric, micro-budget horror film about volunteers fighting for their lives after a drug trial goes wrong.
In 2014, Roberts appeared in the fourth episode of Y Gwyll (Hinterland), a highly acclaimed noir detective series shot in both Welsh and English.
A wealthy family hosts a sumptuous dinner, only for a mysterious young server to chillingly unravel their lives with terrifying consequences they could never see coming.
The Christmas Kid stars Craig Roberts (Red Oaks, Submarine,) in a warm-hearted comedy from writer/director Jamie Adams (Black Mountain Poets), about a former child star who learns what’s really important at Christmastime. Anthony Richards (Roberts) – you know, the Anthony Richards, The Actor – is depressed. His agent (Dolly Wells) has just dropped him, he’s unemployed, and he has little choice but to go home for Christmas - home to his doting mother, his jealous brother and a claustrophobic Welsh community that still reveres him as the home town boy who made it big. Back in his childhood home Anthony has demons to confront. But when Patricia (Erin Richards), the Head of Drama at the area’s most prestigious stage school, presents Ant with an offer to write and direct a play, Anthony finally has the chance to leave his Christmas Kid’s baggage in the past, once and for all.
A young man and young woman, both who have recently gone through break-ups, become friends over the festive season though don't wish to be each other's respective rebound. To get over this, the man goes on a series of disastrous dates so he can get together with the girl he really likes.
An all star cast unite to perform a distinctive BBC Wales Television adaptation of Dylan Thomas's radio play, presented in collaboration with National Theatre Wales, to mark the centenary of Dylan Thomas' birth. The plot reveals the innermost thoughts of the residents of the small, Welsh fishing village Llareggub as it delves into the dreams of various townspeople including blind sailor Captain Cat, who is haunted by visions of drowned shipmates, Mog Edwards and Myfanwy Price, who dream of each other, and Mrs. Ogmore Pritchard, who dreams of her former husbands.
A group of volunteers find themselves fighting for their lives when a drug trial goes horribly wrong.
Patagonia narrates the journeys of two women - one looking for her past, the other for her future. The film inter-cuts between their stories, in which one of them travels south to north through the Welsh springtime and the other east to west through the Argentine autumn.
After a painful breakup, Ben develops insomnia. To kill time, he starts working the late night shift at the local supermarket, where his artistic imagination runs wild.
Costanza is drinking a beer in a Prague pub, a summer night in 1968, while a violinist enters and starts playing a "canone inverso" for her. It is not a case, that music and that violin have a story behind that could concern her. It is the love story between Jeno Varga and the music, between Jeno and Sophie.
A young Jew in 1911 Wales tries to make his living by selling fabrics door to door, but to do so he must hide his nationality. On one of his sales he meets and falls in love with a demure young woman with a strong-willed father and a Jew-hating brother. The two fall in love and she becomes pregnant, but only then does she learn of his ethnic background. When anti-Jewish riots break out, the two are forced to flee and become separated.