Greg Alter is an actor, known for Casper the Friendly Ghost: He Ain't Scary, He's Our Brother (1979).
| Year | Image | Character | Title |
|---|---|---|---|
| 1979 | 
|
Dirk | Casper Saves Halloween |
Greg Alter is an actor, known for Casper the Friendly Ghost: He Ain't Scary, He's Our Brother (1979).
| Year | Image | Character | Title |
|---|---|---|---|
| 1979 |
|
Dirk | Casper Saves Halloween |