A DANGEROUS MIND (Young Alucard)
Screw Young Walter, young Alucard is the cutest kid in Hellsing! o^-^o
I just love ickle Alu to bits!
The song is A Dangerous Mind by Within Temptation, images by Solid&ETC
DISCLAIMER: THIS IS A FAN-MADE VIDEO, COMPLETELY UNNASSCOCIATED WITH THE ARTISTS! HELLSING IS COPYRIGHT KOUTA HIRANO. THE SONG IS COPYRIGHT WITHIN TEMPTATION AND IT'S AFFILIATES THERIN. I HAVE NOTHING TO GAIN FROM CREATING THIS VIDEO!
EDIT: Wow, to clear up some questions I have been unable to get to...
Alucard as a kid, alternatively called Babycard/Young Alucard/etc, is shown in the tail end of volume 8.
Alucard as a girl is Girlycard/Lolicard. 'She' is in Hellsing: the Dawn. She is not young Alucard, merely a form he takes, like the Hellhound.
They are in a lot of pictures because SOLID&ETC draws them together. I do not know why, you'd have to ask the artist.