'Sarah learns just how difficult piloting a course through the ever-changing Time Vortex can be when the Doctor admits to her that their trip to the beaches of Geshtinanna will take nine weeks. At first she thinks she'll be able to cope, but as time wears on, even the infinite interior of the TARDIS becomes boring and she runs out of things to talk about with the Doctor. Over a month into the journey all of the clocks stop, even her watch -- and the Doctor notes movement on the scanner, a ghost-TARDIS whose crew miscalculated and set it on an infinite path through the Vortex. The crew are long since dead, and the TARDIS' physical structure has decayed to nothing, leaving only the bare fact of its existence, endlessly travelling. The Doctor and Sarah appear to be on a parallel course, but they won't know for sure until they materialise. This threat hangs over their heads for another two weeks, and Sarah finally snaps when she finds a tea kettle and an ordinary bag of tea but realises there's nowhere to plug it in. The Doctor fetches her a handkerchief as she cries, a small gesture which shows that he does understand what she's going through, in a way. Finally, the TARDIS reaches its destination, and, thankfully, materialises. They are in a jungle, nowhere near where they intended to be -- but it's a marvellous place to visit nonetheless.'
[The Doctor is the Fourth Doctor.]
Source: drwhoguide.com (http://www.drwhoguide.com/whotrip8.htm). Sighted 20/5/11