Missão Infinita:
As Martha is traveling freely with the Doctor, the story may be set somewhere between the series three episodes "42" (which follows directly on from Martha's invitation to long-term travel in "The Lazarus Experiment") and "Utopia" (which begins the series finale). However, the Character Bios on the DVD release state that Martha is traveling with the Doctor for one more trip, which seems to set it before "The Lazarus Experiment". Wikipedia
Terra dos Sonhos
Em uma entrevista para a DigitalSpy, Phil Ford (o escritor do programa) afirmou categoricamente que o Dreamland acontece imediatamente após o episódio especial "Water of Mars":
Where does it fit in the Doctor's timeline?
"It's set after 'Waters of Mars'. It's a much more light-hearted story than 'Waters of Mars' or the story that will follow it. As I think Russell said elsewhere, just because of the dark ending of 'Waters of Mars' it doesn't necessarily mean the rest of the journey is going to be doom-laden. The Doctor stops off for a bowl of chili - the kind of chili you could only get in an American diner before 1962, as he says!"