It's possibly from the early 90's.
A group of young aliens (possibly in their late teens/early twentys)respond to the War of the Worlds radio broadcast & crashland into a small country town during Halloween. They are hunted by a robot from they're home planet which was sent to destroy them. (I think) They are also befriended by a young white girl in an alien costume & a young black boy with a lisp who is dressed up as a duck.
Anybody remember this one??
