- Pilot episode
- 3. Stoop Kid
- 4. Helga's Makeover
- 6. Heat / Snow
- 7. Operation Ruthless / The Vacant Lot
- 9. Mugged
- 11. Benchwarmer / Cool Jerk
- 13. Tutoring Torvald
- 14. Spelling Bee
- 17. False Alarm / World Records
- 18. Magic Show / 24 Hours To Live
- 19. Runaway Float
- 20. Arnold's Christmas
- 21. Helga's Boyfriend / Crush on Teacher
- 22. Hall Monitor
- 24. Tour de Pond (does not speak) / Teachers' Strike
- 25. Arnold's Valentine
- 27. The Big Scoop / Harold's Kitty
- 28. Arnold Saves Sid / Hookey
- 29. Save the Tree / New Teacher
- 31. Monkey Business / Big Caesar
- 32. The High Life / Best Friends
- 33. Longest Monday / Eugene's Pet
- 35. Freeze Frame / Phoebe Cheats
- 38. Eating Contest / Rhonda's Glasses
- 39. Eugene Goes Bad / What's Opera, Arnold?
- 40. Arnold's Halloween
- 41. The Aptitude Test
- 42. Curly Snaps / Pre-Teen Scream
- 43. Stinky Goes Hollywood
- 44. Rich Kid
- 45. Helga Blabs It All
- 46. Arnold Betrays Iggy / Helga and the Nanny
- 47. Dangerous Lumber
- 48. Arnold's Room / Helga vs. Big Patty
- 49. Career Day / Hey Harold!
- 50. Casa Paradiso / Gerald's Tonsils
- 51. Phoebe Takes the Fall / The Pig War
- 52. Cool Party
- 53. Sid's Revenge / Roller Coaster
- 54. Road Trip
- 55. Arnold & Lila / Grand Prix
- 56. Arnold's Thanksgiving
- 57. Girl Trouble / School Dance
- 58. Helga's Show / The Flood
- 59. School Play
- 61. Eugene's Birthday
- 62. Phoebe Skips
- 63. Full Moon / Student Teacher
- 64. Big Gino
- 65. The Beeper Queen
- 66. Headless Cabbie / Friday the 13th
- 67. Helga's Parrot / Chocolate Turtles
- 68. Love and Cheese / Weighing Harold
- 69. It Girl / Deconstructing Arnold
- 70. Grudge Match / Polishing Rhonda
- 72. Back to School / Egg Story
- 73. Weird Cousin
- 74. Helga Sleepwalks
- 76. Synchronized Swimming
- 77. Helga's Masquerade / Mr. Green Runs
- 78. Helga on the Couch
- 82. Gerald's Game
- 83. Bag of Money / Principal Simmons
- 84. New Bully on the Block / Phoebe Breaks a Leg
- 85. Rhonda Goes Broke
- 86. Sid and Germs
- 87. Beaned
- 89. Suspended / Ernie in Love
- 90. Chocolate Boy
- 91. Harold vs. Patty
- 92. Curly's Girl
- 93. On the Lam
- 94. Phoebe's Little Problem
- 95. A Day in the Life of a Classroom
- 96. Married
- 97. Eugene, Eugene! (singing in ensemble)
- Hey Arnold! The Movie
- 98. April Fool's Day
- Hey Arnold! The Jungle Movie
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Robert/Appearances
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