Walker

Walker Is an antagonist from the Danny Phantom TV series in Nicktoons Unite. He is the vigilante warden of the large prison in the Ghost Zone, where he imprisons the inhabitants for offenses that range between major crimes and minor offenses.
== History ==
=== Nicktoons Unite! ===
Walker first appears when the main four characters wake up in the the ghost-zone prison. Walker imprisoned Danny, Spongebob, Timmy and Jimmy. He then, leaves and later appears again after the main four characters escape the prison. A boss battle against Walker occurs, where Walker attacks the player by stepping on the floor and releasing a powerful purple energy and by summoning ghost enemies. After being defeated, Walker doesn't appear again.