Top image: The Everett Collection

By the mid-1960s, the spy craze was climbing to its peak. James Bond was well on his way to his fourth big-screen mission. Napoleon Solo teamed with Illya Kuryakin in television's The Man From U.N.C.L.E. Boys around the country were playing pretend Cold War with their Johnny Seven O.M.A. toy guns.

Groovy, lighthearted spins on the genre — the kind that inspired Austin Powers — such as Dean Martin's Matt Helm movies or James Coburn's In Like Flint were just around the corner. Yet it was Get Smart that opened the doors to the spy parody.

Mel Brooks and Buck Henry created their irreverent, uproarious sitcom in 1965. Get Smart would deliver infectious catchphrases and nifty gadgets. There were villains, cool cars, shoe phones, beauties, puns and an android named Hymie. Don Adams and Barbara Feldon made a perfect pair as Maxwell Smart and Agent 99.

In the years to come, there would be many knock-offs and remakes. The original Get Smart still stands as the best spy comedy. Here are things you might not know about the series.

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1. Tom Poston was close to being cast as Maxwell Smart. When Mel Brooks presented the pilot script to ABC, the network set its mind on Tom Poston as the star, enamored with his work on The Steve Allen Show. Additionally, the executives tried to soften the show by asking for a family vibe, with Max's mother and a cute pooch. These creative differences led to the show landing at NBC instead, and Poston was lost in the shuffle, according to the book It's Good to Be the King: The Seriously Funny Life of Mel Brooks. Poston did fine for himself, though, becoming a beloved part of Newhart. Image: Wikimedia Commons

2. Fang the dog was written off the show. The snarky Brooks did add a dog at the behest of the network, though the creators named the hound Fang and gave him a shaggy and snarling look. That did not stop the pooch from becoming a favorite, as he showed up on the cover of many Get Smart comic books. (More on those below.) However, the animal proved to be too difficult and expensive to direct so Agent K-13 was written off the show early in season two.

3. CONTROL and KAOS are not acronyms. Ever wonder what CONTROL and KAOS stand for? Nothing! Though KAOS was "A Delaware Corporation" for tax reasons. Image: The Everett Collection

4. Max drove a Ferrari, a Sunbeam, a Volkswagen and an Opel. What is a spy without a sweet ride? The cute red Sunbeam convertible seen in the credits of the first two seasons is most associated with the show. However, in the pilot, Max whipped around in a Ferrari 250 GT PF Spider Cabriolet. In season three, Volkswagen became a sponsor of the show and Max switched to a curvy blue Karmann Ghia. Finally, in season five, Buick took over sponsorship and Max had a roof over his head on the road with a sporty gold Opel GT. In season four, Max also gets to cruise in a Citroën and a Ford Mustang. Illustration: Jeannine Riske

5. Johnny Carson appeared in two episodes. The talk show legend made a mere handful of television acting roles outside of The Tonight Show, yet he took time to appear as a train conductor ("Aboard the Orient Express") and a king's herald ("The King Lives?") for Get Smart. Image: The Everett Collection

6. Leonard Nimoy, Carol Burnett, Regis Philbin and many more also made guest appearances. Many comedians lined up for bit roles. Burnett, Don Rickles, Steve Allen, Bob Hope and Buddy Hackett all turned up, just to name a few. Stars of Batman and Star Trek showed their faces, too, names like Nimoy, Julie Newmar and Cesar Romero. Image: The Everett Collection

7. Andy Warhol turned Barbara Feldon into pop art for the cover of TV Guide. How awesome were the 1960s? You had genius artists making covers for the TV Guide. Warhol put profiles of Feldon on fields of orange, yellow, red and blue for the cover of the issue from March 5–11, 1966. Image: Huffington Post

8. The show spoofed everything from James Bond to Alfred Hitchcock. In episodes like "Greer Window," "Bronzefinger," "Tequila Mockingbird" and "Die, Spy," the sitcom skewered everything from classic films to iconic novels to its competition. Here are our 10 favorite spoofs from Get Smart.

9. In turn, 'F Troop' spoofed 'Get Smart.' Like all good satirists, Get Smart was up for a little ribbing itself. In the season one F Troop episode "Spy, Counterspy, Counter Counterspy," Pat Harrington Jr. plays "B Wise," a clear parody of Don Adams on Get Smart. It's no wonder — the shows have a connection. Early in his career, Don Adams was in a comedy team dubbed The Young Brothers with Jay Lawrence, the younger brother of F Troop star Larry Storch.

10. 99's real name is never revealed. Not even the duo's eventual marriage spilled the beans on Agent 99's real name. What are your theories? Image: The Everett Collection

11. The 'Get Smart' comic book featured artwork by a legend Dell Comics published eight issues between 1966 and 1967. Steve Ditko, co-creator of Spider-Man and creator of Dr. Strange, penciled some of stories. Image: pencilink

12. There were nine 'Get Smart' novels published in the 1960s. William Johnston, who also penned Happy Days, Monkees and Munsters novels, churned out capers with titles like Max Smart and the Perilous Pellets and Max Smart — The Spy Who Went Out to the Cold. Image: Get Smart Wikia

13. There was a 1980 film titled 'The Nude Bomb.' The Nude Bomb is easily forgotten as it was, indeed, a bomb. The comedy would earn a nomination for the Golden Raspberry Award for Worst Picture but eventually lose to the Village People movie. Perhaps part of the failure was due to the unexplained absence of Feldon and her Agent 99. This time out, Max was working for PITS, an agency that was an acronym, Provisional Intelligence Tactical Service.

14. Don Adams was the voice of Inspector Gadget. Adams provided the perfect voice for the bumbling bionic hero, who was clearly inspired by Max Smart. The actor would deliver some of his classic catchphrases — "Would you believe...?" and "Sorry about that, Chief" — on the 1983 cartoon.

15. Don Adams did White Castle commercials in character. "Would you believe…? A fish sandwich and a regular order of fries for just 99¢!" Adams used his catchphrases to sell everything from hamburgers to rental cars to auto parts to Toyotas.

16. 'Get Smart' was the first television franchise to air episodes on NBC, CBS, ABC and Fox. Beginning on NBC, the show jumped to CBS in its fifth and final season. The 1989 reunion movie Get Smart, Again! aired on ABC. And, finally, we have this forgotten reboot… Image: blingcheese