1. Agent 99 on 'Get Smart'

We all know that Agent 86 is the alias of Maxwell Smart; however, this hilarious spy spoof never revealed the real name of Agent 99. Not even the duo's eventual marriage spilled the beans on true name of Barbara Feldon's character. What are your theories?

SEE MORE: WOULD YOU BELIEVE… 17 SUPER INTELLIGENT FACTS ABOUT 'GET SMART'

2. Number 12 and Number 8 on 'The Twilight Zone'

While it may not be in The Twilight Zone hall of fame, the fifth season episode "Number 12 Looks Just Like You" remains one of Rod Serling's more prescient visions of the future. A morality tale about conformity, the story centers around a teenager named Marilyn who has reached the age when she must choose a beautiful new body model. She resists "the Tranformation," but ends up a gorgeous clone (No. 8) in the end — and enamored with her looks. 

3. B-9 on 'Lost in Space'

Sure, he had a letter in his name, too, but we'd be in "Danger!" if we overlooked the Robinson clan's trusty robot pal.

SEE MORE: EVERYTHING YOU WANTED TO KNOW ABOUT THE ROBOT SUIT ON 'LOST IN SPACE'

4. Seven of Nine on 'Star Trek: Voyager'

Jeri Ryan became a geek idol after taking on the role of the Borg drone gone good. The Star Trek universe gave us a few characters on this list, which should be no surprise. Science fiction is the realm of number names. That being said, there was also a very Cousin Oliver–like kid who popped on Married… with Children named Seven. In season seven, of course.

5. Gary Seven on 'Star Trek'

Pity that Gary Seven never got the series he deserved. Robert Lansing portrayed the mysterious alien man, armed with his "servo" and a resistance to Vulcan nerve pinches. He appears in the season two finale, "Assignment: Earth," which served as a backdoor pilot for a spin-off series that would feature Lansing and co-star Teri Garr. Seven contacts the Enterprise as he attempts to thwart a nuclear doomsday on Earth, circa 1968.

6. Six on 'Blossom'

Whoa! Blossom's B.F.F. had a crush on her brother, Joey. And most of young America had a crush on Six in the early '90s, as actress Jenna von Oy posed for pin-ups in teen magazines.

Image: Teen Beat / Pinterest

7. Number Six on 'The Prisoner'

Is there a cooler number character than the one played by Patrick McGoohan? He was a British agent who wakes up trapped in a strange seaside village after being gassed. Many have speculated that the character is John Drake, the main man from McGoohan's previous series Secret Agent (also known as Danger Man). However, McGoohan denied this. What do you think?

Image: ITV / A&E Home Video

8. 555 95472 from 'Peanuts'

Hey may not be Pigpen, but "5" is certainly one of the more memorable peripheral Peanuts kids, even if few recall his full, truly bizarre name. His dance moves in A Charlie Brown Christmas are iconic. 95472 was the boy's surname, actually a zip code in California, where Charles Schulz was living when the character came into being. He has sisters named 3 and 4. His father explained to Lucy that he was overwhelmed by the preponderance of numbers in modern living and just "gave in." 555 95472 appears in over a dozen Peanuts television specials.

Image: ABC / 20th Century Fox Home Entertainment

9. Number Two on 'The Prisoner'

We couldn't mention The Prisoner without bringing up the mysterious Number Two. Well, Number Twos. Seventeen actors portrayed the enigmatic administrator of "the Village." Leo McKern, pictured, holds the record for most appearances as Number Two, though he only shows up in three episodes.

Image: ITV / A&E Home Video

10. Number One on 'Star Trek'

It's rather sweet in hindsight that Gene Roddenberry would name Majel Barrett's character "Number One," as the two ended up getting married in 1969. Number One, the unnamed second-in-command of the Enterprise introduced in the series pilot, "The Cage," only appeared in that single unaired episode (and in "The Menagerie," which recycled footage from the failed pilot). Barrett went on to play Nurse Christine Chapel in The Original Series instead.