Alex Lawther's breakthrough role was in The Imitation Game (2014).
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Alex Lawther: 12 Facts You (Probably) Didn’t Know About The Rising Star

8. Alex Lawther's breakthrough role was in The Imitation Game (2014).
Alex played a young Alan Turing. Based on the real life story of legendary WWII code-breaker Alan Turing. Benedict Cumberbatch played the older version of Turing.