He is best known for his roles in children's television series, the new Star Wars films and The Dark Crystal: Age of Resistance.
His television acting career began in 2007, when he portrayed Igglepiggle in the CBeebies show In the Night Garden....[citation needed] In 2010, he played Tang in "ZingZillas" also for CBeebies and in 2015, he took on the role of Dipsy in the reboot of Teletubbies, previously portrayed by John Simmit before it went into a 14-year hiatus.
[citation needed] Kellington appeared in the 2016 Star Wars film Rogue One as Bistan, a Rebel Alliance gunner.
[citation needed] He also appears in 2017's Star Wars: The Last Jedi as Snook Uccorfay, a mole-like playboy in the casino city of Canto Bight.
[1] In 2019, he appeared in The Dark Crystal: Age of Resistance as the creature suit performer providing the body movements for skekMal/The Hunter, one of the Skeksis new to the series.