San Francisco Police Lieutenant Virgil Tibbs is called in to investigate when a liberal street preacher... Sidney Poitier,Martin Landau,Barbara McNair,Anthony Zerbe,Edward Asner,Jeff Corey,Norma Crane,Juano Hernandez,David Sheiner,Beverly Todd,Ted Gehring,Linda Towne,Garry Walberg,George Spell,Wanda Spell,John Alvin,Michael L.