A Routine Route to South America
Hopalong Cassidy (William Boyd) and Lucky (Russell Hayden) find themselves helping to drive cattle down to Jose Valdez's (Pedro de Cordoba) in South America along with friend Fernando (Sidney Toler) also along for the ride. But it seems like someone doesn't want them to succeed in getting there and Hoppy quickly realises that someone is Ralph Merritt (Sidney Blackmer) who has his eyes on Valdez's property and has been behind the personal tragedies which have befallen Valdez.
"Law of the Pampas" sees two things happen, one is Hopalong heads into South America and two we have Sidney Toler show up in the comedy sidekick role which previously Gabby Hayes had filled. But beyond those two things the rest of "Law of the Pampas" is just a routine oater from the 1930s which sees a corrupt businessman up to no good to get someone's land and of course Hoppy gets suspicious and not only works out what is going on but puts a stop to it. Sadly there isn't much more to it than that and whilst it is entertaining enough it is pretty forgettable.
What this all boils down to is that whilst "Law of the Pampas" may entertain those who are huge fans of Hopalong Cassidy for anyone else this feels just a regular oater with a routine storyline delivered in a routine manner.