Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
If you mean what Doctor Who episodes to watch - I'd suggest watching The Empty Child as that introduce Jack Harkness - and probably bad Wolf/ Parting of the Ways, as that is where he got his immortality from.
I'd also suggest the Series 3 finale (Utopia/ Sound of Drums/ Last of the Time Lords) - following on from the end of Torchwood series one. These episodes help Jack come to terms with his immortality, and also feature Martha Jones who joined Torchwood briefly.