Russell T Davies, producer of Torchwood, said in a November 2010 interview he'd love to see it happen, but it's up to Steven Moffat, the current producer of Doctor Who, to make that decision. The odds are slim given that Torchwood is currently co-owned by the BBC and the American network Starz, and Starz is a competitor to BBC America, which currently airs Doctor Who in the US (BBC America is considered a separate company to the main BBC in the UK). Starz may not allow one of its characters to crossover.
yes
The 9th Doctor's (Christopher Eccleston) companion was mainly Rose Tyler, but he also traveled with Jack Harkness, and Adam Mitchell - but sent him back home when he greedily had an infospike put in his head in an attempt to gain knowledge of future, being the only companion to last only one trip with the Doctor, and never be seen again. Rose was sent to a parallel universe, but still eventually came back, and even though Jack died in the last episode of series 1, he was brough back to life, after Rose had looked into time itself and had the ability to do so, and when she did that, Jack was no longer able to die, and is why he was able to return throughout the series.
Carry On Again Doctor was created in 1969-08.
The duration of Carry On Again Doctor is 1.43 hours.
I don't think so. After the human version of the doctor went with Rose Tyler to the parallel universe, they don't appear again in the program. Both actors (David Tennant and Billie Piper) do appear in later series (in the 50-year anniversary), but not in this specific role.
To appear again
Not again
Yes.
yes it can.
Yes, it is a verb. It means to appear again after leaving, or vanishing.
Captain W. E. Johns
Captain Crawfish is defeated in battle on Skullduggery island, but appears again as a character on Super Villain Island (2012). He spends all but a tiny part of the island asleep.