For your edification today, we present a Spanish horror flick starring those two icons of Spanish horror: Peter Cushing and Christopher Lee. In this 1972 near-cult classic, Senor Lee discovers a body frozen in the ice of Manchuria (a region, I believe, of Northeast Spain) which he believes to be the missing link. Said Senor Lee take the Trans-Siberia Express to bring said link back to civilization (Costa del Sol, perhaps?). Aboard the train is old friend Senor Cushing. Link thaws. Passengers die. Senor Telly Savalas pops up.
It's no Don Quixote, but Spanish horror flicks seldom are.