ABC and Marvel have released the trailer for the next episode Agents of S.H.I.E.L.D.. Watch the clip and read further at your own risk, as there are MAJOR SPOILERS FOR LAST WEEK’S EPISODE AHEAD.

In the previous episode The Man Behind the Shield, it was revealed that Alphonso “Mack” MacKenzie (Henry Simmons), Phil Coulson (Clark Gregg), and Daisy Johnson (Chloe Bennet) had been replaced by Life Model Decoys. The original people are now held captive and trapped into a computer simulation of the real world by Dr. Holden Radcliffe (John Hannah)

In this trailer, Dr. Holden Radcliffe has commanded the life model decoys to lock down the base, effectively crippling S.H.I.E.L.D. Only Leopold Fitz (Iain De Caestecker) and Jemma Simmons (Elizabeth Henstridge) are aware of the fact that their companions have been replaced. In addition, the LMDs have reactivated the replica of Agent Melinda May (Ming-na Wen) to assist them.

In the trailer, Fitz and Simmons seem to be several outmatched by the Life Model Decoys. As their biggest inhuman asset has now been captured as well as several of their best fighters, the battle to reclaim the base is more difficult.In addition, as Radcliffe has managed to replace the most high ranking members of S.H.I.E.L.D, the LMD’s would be able to command lower ranking agents to act on their behalf as well.

A possible ally for Fitz and Simmons may inadvertently reveal itself in the LMD May. When she was initially outed as a robot, she begged Radcliffe to take her with him. However he refused, claiming she wasn’t meant to be long term. However, as she is reactivated by the other life model decoys, it remains to be seen what her true loyalties may be, now that her creator has already betrayed her once.

The next Agents of S.H.I.E.L.D. Episode 4×15 Self Control, airs Tuesday, February 21 at 10 PM on ABC. The press release for that episode can be viewed here