It's Always Sunny in Philadelphia/Mac Bangs Dennis' Mom
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Mac Bangs Dennis' Mom is the fourth episode of the second season of It's Always Sunny in Philadelphia, and the eleventh episode overall.
Mac stops by Dennis' mom's place to pick up Frank's toupee. As he is preparing to leave she undresses in front of him. He goes to see Charlie who tells him that he should have sex with her. After doing so, Dennis' mom kicks Mac out of her house, but he won't leave until she gives him a kiss goodbye.
Dennis comes up with an idea to get out of doing work at the bar; he starts dating Charlie's ex-girlfriend. He blackmails Charlie into letting him get off of the work in exchange for not sleeping with his ex-girlfriend. Dee comes in asking for her old job back and Charlie says he will give it to her in exchange for help with the Dennis situation.
Charlie takes Dennis to his mother's house and they witness Dennis' mother and Mac kissing. Charlie suggest to get back at him that he should sleep with Mac's mom. He goes to her house but she (an old chain-smoker) turns him down. Meanwhile, Dee has taken Charlie's exgirlfriend to witness Dennis' attempt. Dee tells her not to trust Dennis. Charlie calls her and tells her it's time to move to phase two. Dee shows up at Dennis' and tells him that phase two is that Charlie wants her to have sex with him. They decide that everything has been Charlie's fault and that to get back at him Dennis is going to sleep with Charlie's mom. Dee takes Charlie's exgirlfriend and they witness Dennis again trying to sleep with one of their moms. Dee tells her that to get back at Dennis she needs to sleep with Charlie, but instead she sleeps with Frank.
- Dee gets her old job back as the bartender.