Callan - Season 4 is excellent tv show from 1972. Callan - Season 4 is by far one of the best online tv shows I've ever watched. It's probably the most known Crime tv show and it's really entertaining. The tv show is interesting, it does not get boring, it does not get long and although it is not an original production, good acting and skilfully written script make it worth watching. The soundtrack is the greatest asset of this tv show. Feel free to play the tv show online or download it to your computer.