The two shared a short-lived sexual relationship, which has apparently been kept secret from the rest of the gang.
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- In the episode "Charlie Has Cancer" out of all the gang, Dee seems to be the only one concerned.
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- In The Gang Gets Held Hostage, Dee and Charlie team up in order to survive. They also share a kiss in the heat of the moment that is never mentioned again.
- In The Aluminum Monster vs. Fatty Magoo, Dee takes Charlie shopping as he only has four articles of clothing that are all dirty but refuses to help him shoplift anything. When Dee decides to make a dress to get a one-up on her high school best friend Ingrid Nelson. Charlie agrees to help sew it, but later declines after being brainwashed by Mac and Frank in their sweatshop scheme. He also implies that he would like to have sex with her after getting too flustered by Dennis' own dress design sketches which feature only huge breasts and tiny waists. During the scene, Charlie is describing the way he would end up having sex with this woman, then promptly turns and gives Dee a once over before asking, "What are you doing, cause you're looking pretty -- " and then she cuts him off.
- In The Gang Sells Out, Dee helps Charlie get a job at 'Oldies Rock Cafe' but Charlie betrays her and gets her fired for misconduct in an attempt to get closer to The Waitress.
- In Frank Sets Sweet Dee on Fire, Charlie does not seem to care that Dee was set on fire and is more annoyed that she failed to look heroic while saving the cats causing his movie to be ruined.
- In The Gang Gets Whacked (Part 2), Charlie and Dee team up to sell their cocaine and get themselves and Rickety Cricket addicted. They also fail to sell the drugs or to make any money and in the end try to pass of self-raising flour as cocaine.
- In The Gang Dances Their Asses Off Dee and Charlie are briefly paired up as partners and unlike other members of the Gang she does not use this opportunity to drop him. However she later convinces him to get Mac thrown out of the competition and tricks him into eating a brownie filled with cold medicine.
- In Mac and Dennis: Manhunters, Charlie and Dee steal some of Franks meat and have a date like setting with flowers and only one plate, and later learn it might have been human meat causing them to develop an insatiable cannibalistic hunger.
- In America's Next Top Paddy's Billboard Model Contest, Charlie and Dee team up to make viral videos of her "improv" characters. Charlie spices them up by throwing a volleyball at her face in the middle of the shoot and dressing up as Greenman during her shoots. While filming, they are interrupted by a man who recognizes her as PatheticGirl43, a YouTube channel Charlie started with Dee's private video journals. When Dee finds out she has amassed 80,000 hits she tries to milk the channel but once again tries too hard to be funny and appears aloof.
- In Mac and Dennis Break Up, Charlie tries to help Dee get a cat out of her apartment wall by letting more cats into the wall.
Season Six Edit
- In The Gang Gets a New Member and Dee Reynolds: Shaping America's Youth, Dee and Charlie get jobs at a high school, Charlie as janitor and Dee as substitute theater teacher. They are fired when Dee brings her class to the bar to watch Lethal Weapon 5 and a student shows up to school in blackface.
- In Charlie Kelly: King of the Rats, Dee takes Charlie to the movies in order to keep him out of the bar while planning his birthday party and appear more altruistic. Charlie spills his spaghetti in Dee's purse and frustrates Dee so much that he leaves the theater and she goes to the spa alone.
Season Seven Edit
- In Thunder Gun Express, Charlie leads Dee through the sewers to get to the cinema in time. Charlie ditches Dee when her shoe gets stuck in the grate and the "wall of water" (raw sewage) washes over her.
Season Eight Edit
- In Charlie and Dee Find Love, Dee is driving Charlie around to help him stalk the Waitress when they get into a car accident. The other car's passengers turn out to be a rich brother and sister who decide to go on a double date with them. Charlie and Dee go on the date pretending to be much higher class than they are but Charlie cracks at the sight of cheese. The brother and sister are relieved to find out that they are lower class.
- In Charlie Rules the World, Charlie and Dee team up to play an online avatar game called "TechPocalypse". Their in game characters briefly rule together.
Season Nine Edit
- In Mac and Dennis Buy a Timeshare, Dee enlists Charlie to help her with her pyramid scheme, and they both try to scam Ben the Soldier with The Maniac following close behind.
Season Ten Edit
- In The Gang Misses the Boat, Mac, Dennis, and Frank storm out of the bar, leaving Charlie and Dee go to a diner and support each other in doing what they want without fear of the rest of the gang making fun of them. Later at Dee's apartment, they get into def poetry together (much to the frustration of Dennis). When Charlie suggests they perform, there's much sexual tension and two of them make out and possibly bang. The next day at the bar, they are being very awkward and agree with Frank that the gang should go back to normal.
- In Frank Retires, Charlie and Dee take a blood oath, and agree to remain in cahoots with each other.
- Season One
- Dee asks Charlie to come with her to visit her grandfather at the nursing home. Charlie tags along after watering down their agreement to him borrowing her car once and a free lunch. Before splitting off onto his own adventure of uncovering her Grandfather's past. (The Gang Finds A Dead Guy)
- Season Two
- Charlie and Dee under the influence of "roid rage" step out from the bar to fight. After a brief but vocal back and forth, Dee pushes Charlie into a parked car. The angered driver steps out of the car and aggressively confronts the pair, which results in their focus being shifted onto the driver. Later on Dennis informs Mac, after getting off the phone with Charlie, that Charlie is in jail with Dee for 'beating the shit out of some guy in front of the bar'. (Hundred Dollar Baby)
- Charlie gets Dee to help him manipulate both Dennis and the Waitress in exchange for Dee being excused from doing Charlie Work. Both Charlie and Dee convince Dennis to attempt to sleep with Mac's mom, and then Charlie's mom, to get back at Mac for sleeping with Dennis' mom. Dee manipulates the Waitress and follows Dennis to convince her that Dennis is a pervert with the ultimate goal of getting the Waitress to sleep with Charlie. (Mac Bangs Dennis' Mom)
- Season Four
- Charlie and Dee team up to find the source of Frank's meat. Eventually deciding that Frank must be tricking them, and that the meat is actually human meat. They bring a homeless guy back to Charlie's apartment, where they attempt to eat him before scaring him off. (Mac and Dennis: Manhunters)
- Season Five
- Team up to try and get the lawyer to perform free legal services for them. (Paddy's Pub: Home of the Original Kitten Mittens)
They're the only two members of the Gang who have banged each other. They never properly address what happened and keep it as a secret between the two. Offhandedly, when it's relevant and they are alone, Charlie has brought up having sex again. With Dee belittling, turning down, or straight forwardly ignoring the suggestions.