13. Arnold's Halloween (2026)

For more details, you can find the full script on the Hey Arnold Wiki .

As the townspeople prepare for a "war" against the invaders, Helga and the other kids happen to be trick-or-treating in silver alien costumes, making them the primary targets of the panicked mob. 13. Arnold's Halloween

His iconic and humorous reaction to the "invasion," which remains a fan-favorite scene. For more details, you can find the full

Grandpa Phil’s "Halloween is serious business" speech and the boarding house residents’ commitment to scaring "the living daylights" out of people. For more details

The prank becomes too real when Doug Cain, a gullible local reporter, overhears the broadcast and reports it on the evening news.

The boys' creative use of household items—like a sink and a blender—to create "otherworldly" spaceship noises.