Bizarro Episode:The Man Who Liked Ants which features The Saint stopping world domination by ants. Seriously. A Mad Scientist breeds ants to grow in size and intelligence, believing them to be a 'purer' and more admirable life form cheated out of its glory by the evolution of fallible and in-fighting prone humanity. Templar kills the ant queen and her nest before it can hatch. It's also a weird episode, because it's one of the few times you actually see Templar afraid and briefly has the heebie-jeebies about insects for a little while following it.
Fair for Its Day: Compared to his British (roughly) contemporaries Bulldog Drummond and Richard Hannay, Simon Templar is astonishingly forward-thinking in terms of ethnicity. This doubtless can be traced to Charteris' own Asian-European heritage. There are only a couple of times in the entire Charteris-written oeuvre that any positive character uses an ethnic slur, and each time Charteris is careful to point out that said character is reacting from their upbringing, not their conviction. Charteris is equally forward-thinking in portraying Patricia and Simon's relationship. At a time when American adventure heroes had to settle for "constant companion" Margo Lane or "fiancee" Nita Van Sloan, Pat & Simon are clearly living together; while their sexual relationship is never discussed in detail, it is made quite clear that they are lovers, with no negative consequences (at least in the Charteris stories).
Bizarro Episode: Early on, The Saint would help friends and strangers. Then he started to doing the occasional espionage job for the government. Then, in "The House On Dragon's Rock" (an adaptation of The Man Who Liked Ants, above) he stops a Mad Scientist's giant ant and its eggs from taking over the world. The ant is, of course, a Nuclear Nasty.
"Sibao", adapted from "The Questing Tycoon", sees The Saint emroiled in voodoo.
Funny Moments: In "The Rhine Maiden", Simon enters a train compartment containing an old English couple. to climb out the window to get to the carriage where the villain is. The woman remarks that he must be foreign, because he didn't close the window.
Harsher in Hindsight: In season two's "Marcia", the titular actress is almost killed when a prop gun is loaded with real bullets. This eerily predicts what happened to Brandon Lee on The Crow.
Heartwarming in Hindsight: The first Season Finale "The Charitable Countess" has Simon helping street urchins by stealing jewellery from aristocrats. Many years later, Roger Moore became a goodwill ambassador for UNICEF. On a related note, "The Lawless Lady" has him donate the villains' loot to an orphanage, while "The Revolution Racket" has him donate money he's swindled from revolutionaries to UNICEF.
In "Louella", Simon impersonates an MI-5 agent. The woman he was tricking even remarked that it was great to have James Bond on her side. This was ten years before Roger Mooremade his debut as Bond. The same episode guest stars David Hedison, who later played opposite Moore as Felix Leiter.
In addition to that, Lois Maxwell (the original Miss Moneypenny) guest-starred in two different episodes during the 5th series in 1966, seven years before Moore would go on to play Bond, thus also making them working together in the Bond films an unintentional case of I Want You to Meet an Old Friend of Mine.
Season three's "Sibao" sees The Saint deal with voodoo in Haiti, almost a decade before Live and Let Die saw Moore deal with the same subject.