The Alter Ego

The Alter Ego is the first episode of Supernatural: Anime Series. It is a remake of the TV series' Season 1 episode, Skin.

Plot
A man Zach Evans, savagely murders his wife, Amanda.

Sam and Dean are on the road heading to Missouri. Sam is having a nightmare about Azazel visiting his crib as a baby, and as Jessica bursts into flames, he wakes up. Dean points to a newspaper report about a series of gruesome killings in a small town. All the suspects claim to be innocent as they were never at the crime scene.

Sam and Dean visit the local P.D, to meet a man named Boyle. Despite the room being filled with men, Dean stops a woman and asks for Boyle. She says that she is Boyle. Katherine Boyle. She takes them to interrogatioin room that holds Zach. Zach pleads innocence and breaks down. The brothers are convinced that he is teling the truth. They review the footage of the cameras above the Evans' residence. Sam notices Zach's eyes shine when he looks at the camera.

They investigate the house, and Katherine reveals that she knew Amanda for many years. Sam notices a trail of blood eading into a nearby sewer entrance. They get into it and begin searching for the culprit. Using a moment of distraction due to a rat, the shapeshifter injures Dean's shoulder with a pipe and knocks Sam unconcious before he can react.

Sam wakes up to find the shapeshifter in Dean's disguise who goes to visit Katherine. Sam struggles with his bonds which causes a few rocks to displaced, one of which strikes Dean's head who is below, causing him to wake. Dean burns through his bonds and the brothers rush to rescue Katherine.

Back at her house, Katherine refuses to believe Dean's story about a shapeshifter. The real Katherine is being held captive and the one in the house is a shapeshifter. She points a gun at Dean just as a SWAT team surrounds the house. The shapeshifter utters a scream to fool the SWAT, jumps through a glass on the ceiling and escapes. Sam arrives on time, only to be stopped in his tracks by a SWAT member. It is revealed to be Dean.

The brothers get into the car and are searching for the nearest sewer entrance to hunt down the monster. Dean suspects that the person beside him is not his little brother. Sam is shocked to hear this from Dean. Both suspect each other of being a shapeshifter. They both wrestle for the lone pistol in the car. Sam eventually gains the upper hand. The trigger is pulled.

Another Sam is shown running towards the car and is revealed to be real Sam who infact shot his doppleganger who was sitting beside Dean, through the car's windshield. They then rescue Katherine and head back onto the road.