just a question i've got up to series eieght on dvd how many series are there? been trying to get em all hopefully i've made it.
There were eight seasons during the original, classic NBC run in the 1970s. But COLUMBO returned on ABC in the late '80s and in the 1990s for new episodes and movies and many of those are now becoming available to buy on disc.
Actually there were only seven seasons, preceded by two pilot movies. Well, actually one standalone TV movie based on a play, then a pilot movie to see if the idea would work more than once, then six seasons as part of the NBC Mystery Movie wheel from 1971-77 (alternating with McCloud, McMillan and Wife and assorted also-rans in the fourth slot), then a seventh "season" of five intermittent specials in '77-8 after the Mystery Movie series had been cancelled.
The revival series was part of an ABC Mystery Movie wheel that ran for two seasons from 1989-90, along with such little-remembered partners as B.L. Stryker with Burt Reynolds, Gideon Oliver with Louis Gossett Jr., Christine Cromwell with Jaclyn Smith, and in the 1990 season a brief Kojak revival with Telly Savalas. History repeated itself after a fashion, with Columbo continuing as a series of standalone TV movies after the rest of the wheel came to an end. After four episodes in the first Mystery Movie season and six in the second, it then had three movie specials in the '90-'91 broadcast season (meaning fall to spring), two in the '91-2 season, one in November '92, three in the '93-4 season, then intermittent specials in '95, '97, '98, 2000, and 2003. (Wikipedia's episode guide for the revival series just lists them by year, not season.)
The "Eighth Season" on DVD is actually the five episodes from 1989, meaning the first season and one from the second of the ABC Mystery Movie. There's a recently released "Ninth Season" DVD of the six 1990 episodes, meaning the rest of the second season and the first post-Mystery Movie special. The remaining 13 specials from 1991-2003 have not yet been released on DVD, apparently.