- Gregg Berger as High Muckyduck
- Hamilton Camp as Fenton Crackshell/Gizmoduck
- Terry McGovern as Launchpad McQuack
- Georgette Rampone as Sevenchins Snootsbury, Doctor, Librarian
- Russi Taylor as Huey, Dewey, and Louie
- Alan Young as Scrooge McDuck
- Toon Disney's reruns of this episode cut out most of the scenes of Scrooge drinking his nerve medicine (though the occurrence where he drinks the medicine right before dropping its bottle cap into Trala La was oddly left in), as well as the scene where Fenton and Scrooge use said medicine to create an explosion in order to get Launchpad's attention.