"The Catfish" is the twentieth episode of Season 5 of The Amazing World of Gumball. It is the 176th episode overall.
When Gumball and Darwin realize Grandpa Louie has no friends, they create one called Muriel, when Granny Jojo finds out Louie has been spending time online with another woman, Muriel not existing isn't going to stop her from being destroyed. 
Important details about the plot or story are up ahead
The episode starts with Gumball on his computer. Darwin asks if Gumball searched his name online again, but Gumball trembles at the thought of those "weird drawings" of him. Instead, he is searching other people's names on Elmore Plus. When Gumball shows Louie's profile to Darwin, he feels pity in seeing Louie's status updates and lack of online friends. They decide to help by creating a fake profile online to communicate with him under the guise of "Muriel."
Once Louie accepts the friend request, he proceeds to ramble incessantly about his life. However, Gumball grows tired of it quickly, with each vibration of his phone interfering with his day and preventing him from sleeping at night. Ultimately, the message seems to indicate that, while his relationship with Granny Jojo started out joyously, he now feels trapped in her presence.
Eventually, Gumball and Darwin decide that they have had enough and want to tell Louie the truth by "meeting up." However, things take a turn when Louie agrees, saying that he believes them to be "more than just Elmore Plus friends."
Meanwhile, at Joyful Burger, Louie tries to hide Muriel from Granny Jojo, who gets suspicious of him. Ultimately, Louie accidentally slips out his relationship with Muriel, causing Granny Jojo to get on the offensive and, seeing that the two plan to meet at the Elmore Mall, sets out to take her down.
Back at home, Gumball and Darwin receive word that Granny Jojo is after Muriel, but the two initially dismiss the warning as they made the character up. However, after searching up where the profile picture came from, they find that she works at the mall; thus, they have to protect the "Fake Muriel" even though she has no knowledge of the scheme.
At the mall, the pair try to protect Fake Muriel (while being repeatedly bombarded by a real Muriel). Eventually, at the pet store, they are forced to tell the truth to calm Granny Jojo down. Louie is disappointed and angry at the prospect of being literally catfished. Darwin objects that none of it would have transpired had Granny Jojo not been so controlling of Louie. He, in turn, explains that by saying, "more than just Elmore Plus friends," he simply meant he wanted a friend in real life, something that Granny Jojo never let him have. Realizing her mistakes, she decides that she will let him have just one friend.
Gumball and Darwin get on the computer to see who Louie's new online friend is, only to find that it was Granny Jojo. They sigh, ending the episode.
- Banana Joe
- Mr. Small
- Mr. Smiggles
- Construction Men
- Principal Brown
- Sphere Citizens
- Gumball's Phone
- Blue Elephant
- Carmen's father
- Milk Guy
- Shape Person
- Neck Beard
- Hot Dog Guy
- Green Guy
- Hexagon Lady
- Oval Dad
- Bandage Doctor
- This episode marks Louie's fourth major role. The others were in "The Extras," "The Man" and "The Signature."
- Rocky's Elmore Plus profile contains references to "The Slide." On the same page is a picture of Rocky in a suit from "The Boss."
- Videos of Gumball skateboarding from "The Ollie" and "The Pressure" can be seen under the videos tab.
- Krupoch the Barbarian's name appears on Gumball's pencil case. He previously appeared in "The Plan" and "The Puppy."
- In the close-up of Granny Jojo's angry face, music from "The Joy" is reused.
- On the walls of the pet store is the motivational poster of a groundhog lifting a weight that Gumball showed to Mr. Robinson in "The Poltergeist." The photograph displayed below it is a modified version of one of the cat pictures featured in "The Internet."
- The snake that tries to strangle Darwin in the pet store is the same one Penny encountered in "The Romantic."
- The title of the episode may be a reference to the MTV TV Show "Catfish".
- The show is presumed to have created the term Catfish, as referring to someone who pretends to be someone they are not via the internet.
- The pictures of Gumball that momentarily show when Gumball is remembering things he has seen from looking up his name is a direct reference to fan-art that can be seen throughout multiple social media sites, including DeviantArt.
- The line "four score and seven years ago" is a reference to the text of "Gettysburg Address" used in Lincoln's speech, referring to when the Declaration of Independence was signed.
- The scene where Granny Jojo is covered in flowers is a reference to American Beauty.
- When Louie describes his current view on Granny Jojo, Mussorgsky's Night on Bald Mountain is heard in the background.
- The painting that Gumball mistakenly creates while trying to paint Banana Joe is a reference to the American artist Jackson Pollock.
- When Louie is sending messages via mobile, it relates to many teenagers sending small portions of a sentence in chats.
- When Louie says "is so clear" a part on one of his arms are colored white.
- Rocky's demonic profile picture from "The Slide" appears on his Elmore Plus page in certain angles.
- When Louie says "Tell me more about you" on Elmore Plus chat, Gumball is using his own account when he should be using the fake Muriel account. Otherwise Louie should've known it was Gumball.
- Louie's story started four scores and seven years ago. A score is equivalent to 20 years, thus his story started 87 years ago, but he stated in "The Signature" that he was 72 years old.
- His message reads, "...four scores and seven years ago,..." but Gumball read "...four score and seven years ago..."
<ref>tags exist, but no
<references/>tag was found