Doppelganger

Doppelganger is an ambiguous term. It can refer to:
 * a monster throughout the editions of D&D: Canon:Doppelganger
 * the 3.5e statistics of the doppelganger: SRD:Doppelganger
 * a 3.5e player character race: SRD:Doppelgangers (Race)
 * a 3.5e Unearthed Arcana bloodline: Doppelganger bloodline
 * a Ravenloft monster: Dread doppelganger
 * a 3.5e homebrew monster: Shadowkin Doppelganger (3.5e Monster)
 * a 3.5e Big Book of Monsters homebrew monster: Doppelganger (3.5e Monster)