It's regeneration energySee www.youtube.com/watch?feature=player_detailpage&v=E--UUpv58Zs#t=142s
I don't have Auntie Beeb's special effects budget (or skills) though, so 'piss poor photoshop scrawling in yellow' it is!
(I don't have Auntie Beeb's special effects budget (or skills) though, so 'piss poor photoshop scrawling in yellow' it is!
Cloudane,
Mon 8 Apr 2013, 19:25,
archived)
It's rumoured however that some of the lost episodes of Dr Whoactually clarify that the "regeneration energy" is in fact a burst of timelord urine.
( Photoshop Bitch 2014 edition,
Mon 8 Apr 2013, 19:29,
archived)