Scientists Richard Dawkins and Lawrence Krauss travel the globe promoting a scientific worldview and the rational questioning of religious belief.
| Actor | Role |
|---|---|
 Richard DawkinsSelf | Self |
 Lawrence KraussSelf | Self |
 Ayaan Hirsi AliSelf | Self |
 Woody AllenSelf | Self |
 Cameron DiazSelf | Self |
 Ricky GervaisSelf | Self |
 Stephen HawkingSelf | Self |
 Penn JilletteSelf | Self |
 Suzy Eddie IzzardSelf | Self |
 Werner HerzogSelf | Self |
 Daniel C. DennettSelf | Self |
 Sam HarrisSelf | Self |
 Sarah SilvermanSelf | Self |
 Cormac McCarthySelf | Self |
 Tim MinchinSelf | Self |
 Bill PullmanSelf | Self |
 Adam SavageSelf | Self |
 James RandiSelf | Self |