Malefactor

Malefactor is the fifteenth episode of Ben 10: Omniverse.

Plot
Ben and Rook are attacked by Khyber and Malware in a festival.

Major Events

 * Brainstorm makes his Omniverse debut.
 * Mt. Rushmore makes its first appearance as an active Plumber base.
 * Hypnotick makes his first appearance.
 * It is revealed how Malware gotten into his current form.
 * Ben encounters and fights Malware for the first time in 5 years

Omnitrix Alien Debuts

 * Brainstorm (Omniverse debut)

Nemetrix Alien Debuts

 * Hypnotick (first appearance)

Characters

 * Ben Tennyson (16 years and 11 years old)
 * Rook Blonko
 * Gwen Tennyson (11 years old)
 * Max Tennyson (flashback)
 * Earth Plumbers (flashback)
 * Plumber Jerry (flashback)
 * Smuggled Psycholeopterran (flashback)
 * Mr. Baumann (Ben's dream)
 * Pakmar ( Ben's deam)
 * Madison (Ben's Dream).

Villains

 * Khyber (past and present)
 * Khyber's Dog
 * Malware (past and present)

By 16 year old Ben

 * Brainstorm (first re-appearance)
 * Stinkfly (cameo)
 * Wildmutt (cameo)
 * Spidermonkey (cameo)
 * Humungousaur (x3) (third time was cameo)
 * Heatblast (x2) (first time was accidental tranformation; selected alien was Humungousaur)
 * Armodrillo
 * Big Chill

By 11 year old Ben

 * XLR8
 * Feedback

By Khyber's Dog

 * Buglizard
 * Crabdozer
 * Slamworm
 * Hypnotick (first appearance)

Errors

 * Young Ben's eyes were blank after getting scared by the Psycholeterean.
 * In one scene, Rook's Plumber badge on his back was all black.
 * In the flashback, Malware's cannon is on his left hand, while in the present, it's on his right.
 * In the flashback, immediately before Ben selects XLR8, the button on the Omnitrix is on the wrong side.

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.
 * Heatblast shouts his name in this episode, like in Alien Force/Ultimate Alien and Humungousaur and Big Chill in Of Predators and Prey: Part 2.
 * Gwen mentions several events from Ben 10 vs. the Negative 10: Part 2 while approaching Mt. Rushmore, including Upchuck's destruction of the heads on Mt. Rushmore.
 * The logo for the "Dunk Ben 10" game at the Olde Bellwood Fair is stylized like the original series logo.