Critics praised the "quiet dread" and tightening tension. The episode successfully turned the show into a "doubting game" where every character’s loyalty was suddenly under a microscope.
The episode feels "epic" due to the gathering of established guest agents like Victoria Hand, Jasper Sitwell, Felix Blake, John Garrett, and Antoine Triplett. Critical Reception [S1E16] End of the Beginning
“Paxton brought something great to this show in his debut episode that totally boosted this TV show.” IMDb Critics praised the "quiet dread" and tightening tension
The hunt for the Clairvoyant takes a dark turn when it is suggested that the villain is actually a high-ranking S.H.I.E.L.D. agent. Critical Reception “Paxton brought something great to this
The episode maintains high ratings from fans, often cited as an 8/10 or 9/10 for its role in setting up the "Turn, Turn, Turn" saga. Fan Perspectives
"Agents of S.H.I.E.L.D." End of the Beginning (TV Episode 2014)