Malefactor

Malefactor is the fifteenth episode of Ben 10: Omniverse.

Plot
Khyber attacks Ben and Rook at a festival.

Major Events
Brainstorm makes his omnivese debut

Characters

 * Ben Tennyson (16 years and 11 years old)
 * Rook Blonko
 * Gwen Tennyson (11 years old)
 * Max Tennyson
 * Earth Plumbers (Flashback)

Villains

 * Khyber
 * Khyber's Dog

By 16 year old Ben

 * Brainstorm (first re-appearance)
 * Stinkfly
 * Humungousaur (x2)
 * Heatblast
 * Armodrillo
 * Big Chill

By Khyber's Dog

 * Buglizard
 * Slamworm
 * Hypnotick

Trivia

 * This is the first episode in which Khyber's Dog was able to transform/switch forms without Khyber whistling for it to do so.