Misc: one hit wonders aneka got to no 1 in 1981 name the song?

Questions

Dude, what was the original title of the sequel (B&T's Bogus Journey)?

Billy Crystal and Gregory Hines play Chicago police detectives?

The actor who played the leader of the androids.?

The author of the book on which _Blade Runner_ was based.?

The derogatory name applied to the androids.?