The Walking Hills (1949)

Michael accidentally pulls a fast one and makes Pax watch a non-historical Western, John Sturges' The Walking Hills. It stars Randolph Scott and Ella Raines as two members of a party that enters the desert dunes looking for a lost wagon train and (according to legend) the gold that it was carrying.

But even though the movie takes place in the 1940s, the comic Pax read does not. It's the Sixth Gun mini-series Shadow Roads.