This is Season 3 episode 2 "When a Home is a House of Cards". Ruff sends Jay and Noel to learn card-stacking, and Sam and Sammy to make a PSA for an animal shelter.
Noel, Sammy, and Jay are dispatched to Thompson Island where they learn about insects and their habitats while Harsha learns about pow wows in New Mexico.
The Fetch 3000 crashes, so Ruff calls Glen, but Glen will only fix it if he can do something on the show. Glen decides to send all the FETCHers, dressed as Elves, Dwarves, and Wizards, on a mythic Live Action Role Playing mission!
Ruff sends Sam to a high-level meeting with Senator Ted Kennedy. Meanwhile, Noel, Sammy, and DJ are challenged to design a float for Ruff's political campaign.
This is Season 3 episode 1 "The Debut of Smell-o-Vision". Ruff gets sprayed by a skunk, and he sends Harsha and DJ to learn about skunks. He also sends Jay and Sam to the beach to learn to be lifeguards.
Ruff sends Sammy and Jay to the Florida Keys to search the ocean floor for Blackmuzzle's treasure! Harsha and Sam's challenge is to work at a grocery store and compete in a grocery-bagging showdown!
This is Season 3 episode 3 "Just Call Him 'Spot'". Ruff sends Jay, Sam, and DJ to learn how to remove stains. He also sends Noel to learn about being a fire fighter.
This is Season 3 episode 4 "Mr. Ruffman Goes to Washington". Ruff sends Sam to Washington D.C. to a meeting with Senator Kennedy. Also, he sends Sammy, Noel, and DJ to make a float for his campaign.