>>6419479Actually, starting with the fifth season (i.e. last season) of the 2005 series should be fine, since it's the first season with Matt Smith as the Doctor, and introduces all the regulars for the season. Well, River Song was introduced earlier, but who gives a shit about River Song?
Anyways, yeah, last season is important for this season, but if you would like to start back in '05 with the 9th Doctor, and watch through to the 11th, feel free. Beyond that, you might have to do some hunting to find the old series.