For his performance in the BBC and Amazon Prime series The English (2022), he was nominated for a British Academy Television Award.

Spencer's films include Shouting Secrets (2011), Winter in the Blood (2013), Desert Cathedral (2014), Woman Walks Ahead (2017), and Wild Indian (2021).

Spencer did odd jobs while taking acting lessons from coaches David Gideon and Ed Kovens.

[7][8] In 2002, he made his feature film debut as a young version of Eric Schweig's lead character in Skins.

In 2009, Spencer played werewolf Sam Uley in the Twilight sequel New Moon, based on Stephenie Meyer's novel of the same name.

The following year, he starred opposite Emily Blunt in the Western miniseries The English, produced for Amazon Prime Video and BBC One.