BOOM

BOOM is the thirteenth episode of the fourth season of the television series Agents of S.H.I.E.L.D.  and the seventy-ninth episode overall.

Synopsis
Daisy, Mace and the S.H.I.E.L.D. team must find a way to contain an explosive Inhuman. Meanwhile, Coulson and Mack come face-to-face with Radcliffe’s inspiration for Aida.

Plot
After Radcliffe replicates Terrigen crystals, Shockley exposes Ellen Nadeer to it to see if she is a potential Inhuman. But when he releases the Mist, Nadeer is unaffected while Shockley becomes a human bomb who reconsitutes. When Shockley reconstitutes, he calls the Superior to explain that while he is now be Inhuman, he can deliver SHIELD to him on a platter.

Meanwhile, Coulson locates Agnes Kitsworth, an Australian expatriate who was Radcliffe's true love long ago until he left her when he learned she had an inoperable brain tumor. Radcliffe's research into LMDs was primarily intended to cure her tumor, and when she calls him per Coulson's request, but goes to Radcliffe once he explains he can save her.

Cast
Main Cast:
 * Clark Gregg as Phil Coulson
 * Ming-Na Wen as Melinda May
 * Chloe Bennet as Daisy Johnson/Quake
 * Iain De Caestecker as Leo Fitz
 * Elizabeth Henstridge as Jemma Simmons
 * Henry Simmons as Alphonso Mackenzie
 * John Hannah as Holden Radcliffe

Guest Stars:
 * John Pyper-Ferguson as Terrence Shockley
 * Parminder Nagra as Senator Ellen Nadeer
 * Mallory Jansen as Aida/Agnes Kitsworth
 * Zach McGowan as Anton Ivanov
 * Tom Virtue as Motel Clerk
 * Jason O'Mara as Director Jeffrey Mace
 * Max Osinski as Agent Davis
 * Ricardo Walker as Agent Prince
 * Deren Tadlock as Agent Cecilio
 * Bryan Keith as Zach Bynum
 * Abraham Amkpa as Lab Tech
 * Sheila Cutchlow as FBI Agent Jurmain
 * Damian Gomez as Coffee Vendor
 * Johnny Rivas as Waiter
 * Pierce Minor as Watchdog #1
 * Darsha Philips as Field Reporter

Locations

 * Playground
 * Washington, D.C.
 * Park Mesa Motel
 * Spain
 * Caldes de Montbui
 * Maiorca (mentioned)

Events

 * Explosion in the US Senate building per an Inhuman Terrigenesis.
 * Ellen Nadeer is confirmed among the dead following Shockley's change.
 * Mace is captured by the Superior's men as SHIELD is containing Shockley.

Items

 * Phil Coulson's Prosthetic Hand
 * Terrigen Crystals
 * I.C.E.R.s
 * Pick-Lock Devices
 * Patriot Serum
 * Framework
 * Scepter (mentioned)
 * Nitramene (mentioned)

Vehicles

 * Zephyr One
 * Quinjet
 * Containment Module
 * Watchdogs Submarine

Sentient Species

 * Humans
 * Inhumans
 * Life-Model Decoys
 * Asgardians (mentioned)

Organizations

 * S.H.I.E.L.D.
 * May's Team
 * Watchdogs
 * FBI
 * Avengers (mentioned)
 * United Nations (mentioned)

Mentioned

 * Hive
 * Glenn Talbot
 * Steve Rogers
 * Melinda May (Life-Model Decoy)
 * Vijay Nadeer
 * Piper
 * Sokovia Accords

Trivia

 * The explosion caused by Terrence Shockley that killed Ellen Nadeer and destroyed the Stamford Wing of is a reference to the explosion caused by the super-criminal Nitro in  in the comics, that ignited the Civil War.