'Marvel's Agents of S.H.I.E.L.D' Preview: The Ancient Secrets of the Monolith Are Revealed

Spencer Treat Clark played Steven Frame on Another World.  He guest
stars tonight as Alexander on Agents of S.H.I.E.L.D.
Photo Credit: ABC/Kelsey McNeal

Season 3 of Marvel's Agents of S.H.I.E.L.D. continues with a new episode tonight at 9 p.m. ET/PT on ABC. Another World alum Spencer Treat Clark guest stars.

In "Purpose in the Machine," Fitz and the team enlist the aid of an Asgardian to unlock the secrets of the ancient monolith that swallowed Simmons, and Agent May is at a crossroads in her personal and professional life.

In the sneak peek clip below, One Life to Live alum Blair Underwood returns as Dr. Andrew Garner with some news for Daisy she doesn't want to hear.



Marvel's Agents of S.H.I.E.L.D. stars Clark Gregg as Director Phil Coulson, Ming-Na Wen as Agent Melinda May, Brett Dalton as Grant Ward, Chloe Bennet as Agent Daisy Johnson, Iain De Caestecker as Agent Leo Fitz, Elizabeth Henstridge as Agent Jemma Simmons, Nick Blood as Agent Lance Hunter, Adrianne Palicki as Agent Bobbi Morse, Henry Simmons as Agent Alphonso "Mack" MacKenzie and Luke Mitchell as Lincoln Campbell.

Guest starring are Blair Underwood as Dr. Andrew Garner, Peter MacNicol as Professor Elliott Randolph, Daz Crawford as Kebo, Spencer Treat Clark as Alexander, Alex Hyde-White as Lord Thornally, Daniel J. Wolfe as Lord Manzini, Piers Stubbs as younger lord, James Hong as William May and Darius Cottrell as Moe.