Doppelganger

[Omelethead]

Just a few questions on Doppelganger, from the original Munchkin game:

It says it summons a duplicate to fight alongside you for one combat. Does this "clone" update/sync itself with you during combat? Specifically, if a Thief backstabs you after you've played Doppelganger, does your clone get backstabbed, or does the Thief have to discard another card to backstab the clone? Can a Thief backstab a Doppelganger?

If you were, say, a Dwarf and summoned your Doppelganger, and then was cursed with Lose Your Race, which made some of your gear unusable, does the Doppelganger stay as what it was when it was summoned, or does the curse and loss of items affect it too?

Can a Warrior Berserk and then play Doppelganger to get +6? If he Berserk-ed after playing Doppelganger, does/can he still get +6? Would it take 6 cards if it wasn't done prior to playing Doppelganger? (Ditto for the Cleric vs Undead Monsters)

If you beat Pukuchu without using help or bonuses, you get an extra level, but does using a Doppelganger (and just doubling your Level) count as a helper?