The Gang Spies Like U.S.

"The Gang Spies Like U.S." is the fifth episode of the tenth season of It's Always Sunny in Philadelphia. It aired on February 11, 2015 and was viewed by 527,000 people.

Synopsis
After Dennis and Mac enlist Dee to spy on the fish factory across the street, Charlie and Frank grow suspicious and decide to do some spying of their own.

Recap
The gang complains about the reek of fish from the fish factory across the street, and Dennis and Mac enlist Dee to investigate why the fish factory has bought the building next to Paddy's. Charlie becomes jealous that they chose Dee over him, so he and Frank decide to spy on them in return.

At the fish factory Dennis tells Dee she must get a job there to figure out what their evil plot is. Excited to be part of the scheme rather than just the butt of their jokes, she agrees. Back at her apartment, where Dennis and Mac have been living since the fire at Thanksgiving. Dennis and Mac begin some research online. Charlie interrupts, delivering flowers with a camera inside, but the camera does not pick up what they're researching.

Charlie gets Dennis and Mac to have lunch with Frank's credit card so Frank can break in and look at their search history. They dine at Guigino's Italian Restaurant where their waiter recognizes them but they can't remember him. Frank calls Charlie and tells him the only recent search history is for "Asians" and "cream pie" and they assume Dennis and Mac are planning to go into the dessert business with the owner of the fish factory.

Frank proposes cutting Dennis and Mac out of their idea by making a video and presenting it to the manager at the fish factory. At dinner at Guigino's Charlie reveals To Dennis and Mac that he knows they've been researching cream pies. He proposes they three go into business together to sell the cream pies to children. Horrified, Dennis and Mac explain to Charlie what kind of cream pies they were investigating. Charlie calls Frank and explains to him as well.

Meanwhile, Dee has been working at the fish factory and caused three accidents, resulting in fish prices skyrocketing and her hair getting stuck in a conveyor belt. The final accident sends her to the hospital where the men agree to never spy on each other and to clear their search history every time they use a computer.

Starring

 * Charlie Day as Charlie Kelly
 * Glenn Howerton as Dennis Reynolds
 * Rob McElhenney as Mac
 * Kaitlin Olson as Dee Reynolds
 * Danny DeVito as Frank Reynolds

Guest starring

 * Michael Naughton as Waiter
 * Jim Lau as Asian Manager
 * Elizabeth Sung as Female Worker

Trivia

 * Spies Like Us is a 1985 comedy film starring Chevy Chase and Dan Aykroyd as bumbling American spies.
 * Dee at the fish factory conveyer line is reminiscent of the classic I Love Lucy chocolate factory scene.
 * Mac admits that he likes the taste of his own semen, adding to the mounting evidence of his homosexuality (which has since been confirmed).

Quotes
"You guys just hang back, do your thing, don’t eat reptiles, and just hang out."

- dennis

 "What's wrong with your ear?"

- mac

 "I’m to remember every man I’ve seen fall into a plate of spaghetti?"

- dennis

