Answer the following Q with stream of consciousness. Context: Sam Underwood (born 4 August 1987) is a British actor who portrayed the twins Luke and Mark Gray in the Fox thriller drama The Following. As of 2017, he portrays Jake Otto in the hit AMC series Fear the Walking Dead.

Question: who plays luke and mark on the following?
To answer the question, consider the following: Sam Underwood (born 4 August 1987) is a British actor who portrayed the twins Luke and Mark Gray in the Fox thriller drama The Following. Therefore, the final answer is Sam Underwood.