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The Expanse Wiki
This page is about the Tv icon.png TV character. For the books incarnation, see The Investigator (Books).

Book-icon-simple.png Books character Tv icon.png TV character

The Investigator is a construct of the protomolecule, where it uses an edited simulacrum version of Detective Miller's persona to look into something for the protomolecule.



The Investigator interacts with James Holden through the protomolecule's manipulation of Holden's brain, in which he essentially hallucinates The Investigator.

It seems, the character is rebuilt anew every time he appears. Although one appearance doesn't have memories from the previous ones, they are all the same person, with the same mindset and the same set of memories.

Observers are given a clue to the workings of The Investigator through the phrases he is known to mutter, "It reaches out" and "113 times a second".

Throughout the series[]

Note: This is a generic section stub. Expand it by clicking FandomDesktop pencil small-white-26x26.png to right of the section title.


Season Three
1 "Fight or Flight"Absent
2 "IFF"Absent
3 "Assured Destruction"Absent
4 "Reload"Absent
5 "Triple Point"Absent
6 "Immolation"Absent
7 "Delta-V"Appears
8 "It Reaches Out"Appears
9 "Intransigence"Appears
10 "Dandelion Sky"Appears
11 "Fallen World"Absent
12 "Congregation"Mentioned
13 "Abaddon's Gate"Appears
Season Four
1 "New Terra"Appears
2 "Jetsam"Appears
3 "Subduction"Absent
4 "Retrograde"Appears
5 "Oppressor"Absent
6 "Displacement"Absent
7 "A Shot in The Dark"Mentioned
8 "The One-Eyed Man"Appears
9 "Saeculum"Appears
10 "Cibola Burn"Mentioned



  • At the end of "Intransigence", The Investigator explains how he appears to Holden. He is a "non-local quantum hologram", projected to Holden by the protomolecule, via phase-conjugate adaptive waves resonating in the micro-tubules in his brain. To communicate over distances instantly, the protomolecule uses closed timeline curves and Lorentzian manifolds to avoid light speed time lag.

See also[]