- Lazlo, a spider monkey.
- Raj, an Indian elephant.
- Clam, a pigmy rhino.
- Scoutmaster Lumpus, a moose.
- Slinkman, a banana slug.
- Edward, a duck-billed platypus.
- Samson, a guinea pig.
- Chip and Skip, two unintelligent dung beetle brothers.
- Dave and Ping Pong, two dodo brothers.
- Carlos Alazraqui as Lazlo / Clam / Chef McMuesli / Additional Voices
- Jeff Glen Bennett as Raj / Samson / Commander Hoo-Ha / Additional Voices
- Tom Kenny as Scoutmaster Lumpus / Slinkman / Additional Voices
- Mr. Lawrence as Edward / Dave / Ping Pong / Nurse Leslie / Additional Voices
- Steve Little as Chip / Skip / Lemmings / Additional Voices
- Jodi Benson as Jane Doe / Patsy Smiles / Almondine
- Jill Tilley as Nina / Gretchen / Miss Mucus
- Tara Strong and Billy West as additional voices
- Parasitic Pal / It's No Picnic
- The Weakest Link / Lumpy Treasure
- Lights Out / Swimming Buddy
- Tree Hugger / Marshmallow Jones
- Gone Fishin' (Sort Of) / Beans Are From Mars
- Dosey Doe / Prodigious Clamus
- Float Trippers / The Wig of Why
- The Nothing Club / Loogie Llama
- Snake Eyes / Racing Slicks
- Slugfest / Beans and Weenies
- Prickly Pining Dining / Camp Kidney Stinks
- Beans and Pranks / Movie Night
- The Big Cheese / Campers All Pull Pants
- Hallobeanies / Meatman
- No Beads, No Business / Miss Fru Fru
- Burpless Bean / Slap Happy
- Handy Helper / Love Sick
- Parent's Day / Club Kidney-Ki
- The Battle of Pimpleback Mountain / Dead Bean Drop
- I've Never Bean in a Sub / The Great Snipe Hunt
- Mascot Madness / Tomato Paste
- Hello Dolly / Overcooked Beans
- Snow Beans / Irreconcilable Dungferences
- There's No Place Like Gnome / Hot Spring Fever
- 7 Deadly Sandwiches
- Camp Samson / Beany Weenies
- Hello Summer, Goodbye Camp
- The Big Weigh-In / Hard Days Samson
- Waiting for Edward / Beans in Toyland
- Where's Clam? / Bowling for Dinosaurs
- Squirrel Seats / Creepy Crawly Campy
- Sweet Dream Baby / Dirt Nappers
- Spacemates / Temper Tee Pee
- Lazlo Loves a Parade / Are You There, S.M.I.T.S.? It's Me, Samson
- Tusk Wizard / Squirrel Scout Slinkman
- Bear-l-y a Vacation / Radio Free Edward
- Valentine's Day / A Job Well Dung
- The Bean Tree / Taking Care of Gretchen
- Scoop of the Century / Boxing Edward
- Where's Lazlo?
- Hold It Lazlo / Being Edward
- Strange Trout from Outer Space / Cheese Orbs
- Award to the Wise / Cave Chatter
- Ed's Benedict / The Book of Slinkman
- Never Bean on the Map / Harold and Raj
- Lumpus vs. the Volcano / Nursemaster
- Dungs in Candyland / Tour Wars
- Lazlo's First Crush / Livin' La Vida Lumpus
- Samson's Mail Fraud / The Haunted Coffee Table
- Friendward / Camp Dinkey
- Doting Doe Eyed Deerest / Clown Camp
- Edward's Big Bag / The List
- Camp Complain / The Engagement
- Call Me Almondine / Clam the Outlaw
- Penny for Your Dung / Baby Bean
- Kamp Kringle
- Bad Luck Be a Camper Tonight / Step Clam
- S is for Crazy / Samson Needs a Hug
- Wedding Bell Blues / O Brother, Who Art Thou?
- Peace Frog / Lumpus' Last Stand