They all involve someone who is or has met with the Doctor, the main character of each of them has travelled in time and space at some point.
They all have been created by the "Dr" team with the main production company based in Cardiff where Russel T Davies lived and worked whilst writing the new Doctor concept
torchwood: Children of the Earth Day one
The Sycorax were the aliens in Doctor Who with the blood control.
Yeah. He breathed in a virus released by the aliens known as 456, and died in the arms of his lover, Captain Jack Harkness.
Daleks
yes
The new doctor who series six aliens are called The silence! These are not the only new aliens for this series but so far the only ones!
yes, it is possible that aliens can exist.The universe is filled with millions of planets.I am sure there is something out there besides us.
Go to the Sarah Jane Adventures website and go on aliens and click on the Trickster. http://www.bbc.co.uk/cbbc/sja/aliens/pages//trickster.shtml
Aliens aren't real besides Katy Perry and her "E.T."so, no.
Jack is actually bisexual. Or omisexual if you will considering the amount of aliens on the show. He will still flirt with you whether your male or female.
Doctor Who - 2005 Aliens of London 1-4 is rated/received certificates of: UK:PG USA:TV-PG
Aliens? There probably is life besides humans somewhere in the universe. But no one knows yet.