Established way back in the first Christmas special - regeneration takes hours to complete, and in that time you keep regenerating and can fix things like having your hand cut off by a space alien.
The bit about "you can't regenerate, so I can regenerate for you and also this will use up regenerations and we can tell how many there are left and and and and and and and" is terrible writing, lousy worldbuilding, and deus ex machina to avoid having to think of an ending that makes sense.
Robot jellyfish are scary when you have a sonic screwdriver..?
Who the hell puts a security system like that into their time-travelling Hitler-killing space robot?
(no subject)
Date: 2011-08-28 01:52 pm (UTC)Established way back in the first Christmas special - regeneration takes hours to complete, and in that time you keep regenerating and can fix things like having your hand cut off by a space alien.
The bit about "you can't regenerate, so I can regenerate for you and also this will use up regenerations and we can tell how many there are left and and and and and and and" is terrible writing, lousy worldbuilding, and deus ex machina to avoid having to think of an ending that makes sense.
Robot jellyfish are scary when you have a sonic screwdriver..?
Who the hell puts a security system like that into their time-travelling Hitler-killing space robot?