Superfans of these popular sitcoms have come up with these wild fan theories. Read why Toby from the Office might not be who you think he is, and the potential origin story of the infamous Heisenberg from "Breaking Bad."

Penny is a Spy in "Big Bang Theory"

Did you ever find it strange that Penny is involved with a group of friends despite having nothing in common with them? Well, one fan theory suggests that Penny might actually be a spy sent by a foreign enemy to infiltrate a group of renowned scientists to gain their confidential information.

Photography: CBS

Jeff Winger from "Community" is a Time-Traveler

This theory proposes that Leonard, the softly spoken old man who wanders the halls of Greendale, is really a future version Jeff Winger that gets sent back in time future Abed Abed. He then changes his name to Leonard and spends his days watching his past self; this explains how Leonard knew that Jeff ate all the macaroni.

Photography: NBC

"Family Guy" is Written Through Stewie's Eyes

While the show isn’t known for having a realistic tone, this theory posits that Stewie is the reason for that. Stewie sees the world through intelligent, yet still juvenile, eyes. This theory claims to explain why other characters can only understand Stewie intermittently and why the Griffins' dog Brian can talk.

Photography: Fox

Phoebe is Not a Member of the "Friends" Group

Might it be possible that Pheobe never made it off the street and imagined everything that happened as a homeless woman looking through the window of Central Perk? This theory suggests that while the other characters were carrying on as normal, Phoebe was simply projecting herself into their lives as she watched.

Photography: NBC

Malcom Grows Up to be Heisenberg

This theory suggests that "Breaking Bad" is the sequel to "Malcolm in the Middle." Malcolm was an absolute chemistry wiz, so it’s totally plausible that he could grow up to be Lord Heisenberg.

Photography: Fox

Monica is Ross' Half-Sister

This popular fan theory claims that Judy Geller was unfaithful to her husband Jack in order to conceive Monica, making Jack her father in nurture only. This could possibly explain why Ross is more interested in his Jewish heritage than his sister and why Judy favors Ross over Monica.

Photography: NBC

Jimmy Pesto is Jealous of Bob’s Burgers

While the show alludes to rival restauranteur Jimmy Pesto being far more successful than Bob, this fan theory suggests that Pesto is actually the one who's jealous. Pesto's wife divorced him, he dislikes his kids, and his restaurant's food is worse than the Belchers' food, despite its relative success.

Photography: Fox

Toby Flenderson is the Scranton Strangler

This popular fan theory postulates that Toby Flenderson from "The Office" is actually the elusive Scranton Strangler! Toby wasn’t at work the day that everyone was watching the police in pursuit of the strangler, and he even went on to express regret over sending an innocent man to jail after serving on the jury trial for the Strangler’s supposed deeds.

Photography: NBC

Homer Simpson is in a Coma

In a 1992 episode, Homer was told by a higher being that he would pass away in six months. Six months after that episode aired, Homer was crushed by a vending machine and sent into a coma. Although he wakes up at the end of the episode, one fan theory suggests that he never actually did that’s why the characters have never aged.

Photography: Fox