| The series is set in a universe inhabited solely by anthropomorphic animals of many species and focuses on a trio of campers attending a poorly run summer camp known as Camp Kidney. The trio consists of Lazlo, the eccentric, optimistic spider monkey; Raj, the timid Indian elephant; and Clam, the quiet albino pygmy rhinoceros, and their multiple surreal misadventures. |
| Name | Character | Episodes |
|---|---|---|
| Jeff Bennett | Raj / Samson / Commander Hoo-Ha (voice) | 114 |
| Carlos Alazraqui | Lazlo / Clam / Chef McMuesli (voice) | 114 |
| Tom Kenny | Scoutmaster Lumpus / Slinkman (voice) | 114 |
| Steve Little | Chip / Skip (voice) | 114 |
| Mr. Lawrence | Edward / Dave / Ping Pong / Nurse Leslie (voice) | 114 |
| Jeff Bennett | 7 | |
| Tom Kenny | 5 | |
| Jill Talley | Gretchen / Nina Neckley / Ms. Mucus (voice) | 4 |
| Carlos Alazraqui | 2 | |
| Jodi Benson | Patsy Smiles / Jane Doe (voice) | 2 |
| Jodi Benson | Patsy Smiles (voice) | 2 |
| Jodi Benson | Almondine / Mommy Lumpus (voice) | 2 |
| Jodi Benson | Patsy Smiles / Jane Doe / Almondine (voice) | 2 |
| Fred Tatasciore | Big Bear (voice) | 1 |
| Alan Young | 1 | |
| Carolyn Lawrence | (voice) (uncredited) | 1 |
| Charlie Adler | (voice) (uncredited) | 1 |
| Billy West | 1 | |
| Lori Alan | (voice) (uncredited) | 1 |
| Richard Steven Horvitz | (voice) (uncredited) | 1 |
| Mr. Lawrence | 1 | |
| Hadley Kay | 1 |