After being denied access to the Church of Scientology's headquarters, documentarian Louis Theroux teams up with ex-Scientology official Marty Rathbun to stage re-enactments of alleged abuses within the organization. Theroux soon discovers that the church is watching his every move.
| Actor | Role |
|---|---|
 Louis TherouxSelf | Self |
| TTom De VochtSelf | Self |
| MMarty RathbunSelf | Self |
| JJefferson HawkinsSelf | Self |
 Andrew PerezDavid Miscavige | David Miscavige |
| MMarc HeadleySelf | Self |
 Paz de la HuertaSelf | Self |
| RRob AlterTom Cruise | Tom Cruise |
 David MiscavigeSelf (archive footage) | Self (archive footage) |
 Tom CruiseSelf (Archive Footage) | Self (Archive Footage) |
 Ted KoppelSelf (archive footage) | Self (archive footage) |
 L. Ron HubbardSelf (archive photo) | Self (archive photo) |
 James StewartSelf (archive photo) | Self (archive photo) |
 Greta GarboSelf (archive photo) | Self (archive photo) |