Flim-Flam was seen in the first episode, To All the Ghouls I've Loved Before, trying to sell a magic concoction to a local town located in the Himalayan Mountains. However, he was kicked out of town, and managed to meet up with the current Scooby gang, who was trying to find the Mystery Machine (an airplane) hidden by Bogle and Weird. He took them to a psychic (Vincent Van Ghoul) who could help the whole group find their mode of transportation, and warned them of ensuing danger. Daphne is a given a drink laced with wolfsbane due to the fact the townspeople believe that she overheard their secret, and when the night falls on the town, the group finds out that the whole town is actually a werewolf cult. They are pursued into the sewers, and Flim Flam opens one of his products to spray on Daphne, who reverts back to normal. He goes on to cure the rest of the townspeople, who are ever greatful for the helpful. When Scrappy, Daphne and Flim Flam question them as to how they got that way in the first place, they are told that they were turned into werewolves as revenge for sealing the Thirteen Ghosts into the Chest of Demons, and the current group races to keep Shaggy and Scooby from opening the chest, but to no avail.
Flim-Flam often provided the gang with disguises when it was necessary to fool a demon. His mistaken speculation sometimes got the gang in danger, such as when he directed a power-stealing ghost to Vincent Van Ghoul's hotel room under the impression that the two used to be romantically involved in the episode A Spooky Little Ghoul Like You. Some of his fast talking schemes get the gang into trouble, and have also been able to get them out of tough situations with others.
Flim-Flam later appeared in the Scooby Doo telefilms alongside Scooby, Shaggy, and Scrappy. He is a supporting protagonist and ally to Scooby, Scrappy, and Shaggy and would help them stop the monsters.
Flim Flam's reception was mostly negative. His character was seen as an even more annoying and dumb character than Scrappy Doo. Tom Ruegger, a show runner for Scooby-Doo during the 1980s, stated that even he disliked Flim Flam's character.
A different version of Flim Flam makes a tongue-in-cheek cameo in the 2011 Scooby-Doo! Mystery Incorporated episode "The Siren's Song", in which Fred and Daphne come across a statue of him in the Crystal Cove Haunted Museum among statues of their defeated foes. Daphne remarks it's been awhile since she's seen him, as he's serving a 25 years to life prison sentence, which she feels was "stiff" for a preteen con-artist. Of course, this is not canon with the original show.
It is unknown what happened to the original Flim-Flam, it could be said that he was probably left behind or adopted.
It is unknown if he will make another appearance, although there is a small chance.
- In Scooby-Doo Mystery Incorporated Flim Flam is show in a museum full Mystery Inc. villains. But do to Mystery Incorporated's very poor following of all of the original Scooby-Doo shows and movies Flim Flam becoming a villain after the 13 ghosts adventure is not true.