"The subject of this article was cancelled."
This article covers a film, book, comic or game that was cancelled or replaced by another product. Cancelled material is usually not canon; however, aspects of such material sometimes find their way into later products and thus become canon. You have been warned.
The Sentinel was intended to be an early issue of Marvel Comics' The Further Adventures of Indiana Jones but went unused. The plot saw Indiana Jones searching a tomb for the Head of Peloptichonku guarded by a two-thousand year old clockwork man.