Theta Protocol

"I want you and Billy to immediately return to H.Q. If things go radically south here, I'll need you to implement the Theta Protocol." "Sir." "That's an order, Agent Koenig."

- Phil Coulson and Sam Koenig

The Theta Protocol is a S.H.I.E.L.D. protocol led by Director Phil Coulson.

History
As Coulson's team prepared for the trip to the Kree City, Coulson told Sam Koenig to report back to the Playground, claiming that if things went south he would need Sam and his brother to enact the Theta Protocol--much to Koenig's dismay.

According to Agents May and Simmons, Coulson didn't tell them about the Protocol. The separate faction of S.H.I.E.L.D. led by Robert Gonzales and Bobbi Morse saw this as prime example of Coulson keeping secrets.

After being contacted by Agent Maria Hill and debriefing her on the whereabouts of Loki's scepter, Coulson asked her to activate Theta Protocol, claiming it was time to bring in the Avengers.

Appearances
In chronological order:
 * Agents of S.H.I.E.L.D.
 * Season Two
 * What They Become (mentioned)
 * Melinda (mentioned)
 * The Dirty Half Dozen (mentioned)