The Return

The Return is the thirty-seventh episode of Ben 10.

Plot
A shuttle launch at NASA is interrupted by a purple lightning storm. This attracts the attention of Ben, Gwen and Grandpa Max, who hope to discover the origin of the alien werewolf and mummy. While at NASA, Ben runs into an ill-tempered scientist by the name of Dr. Viktor. Surveillance tapes associate him with the purple lightning storm, and he's quickly shown to be in cahoots with the two creatures. Ben, Gwen and Grandpa Max encounter the creatures again, in addition to Doctor Viktor in his true form. Ben uses Snare-oh for the first time to fight the werewolf. Following a losing battle, the Tennysons split up: Max and Gwen board the space shuttle that Doctor Viktor launches and Ben follows Viktor as XLR8. The mummy's onboard the space shuttle, and Viktor sends the werewolf to New Mexico in a flash of purple lightning through use of a teleportation device. But as Ben confronts Dr. Viktor, the scientist reveals that he is not carrying out his own plan. Viktor revives his master, who, to Ben's horror, is revealed to be Zs'Skayr.

Major Events

 * Ben and the gang encounter the alien werewolf and the mummy again.
 * Ben first meets Dr. Viktor in person.
 * Ben first transforms into Snare-oh.
 * Zs'Skayr is revived by Dr. Viktor.

Omnitrix Alien Debut

 * Snare-oh

Characters

 * Ben Tennyson
 * Gwen Tennyson
 * Max Tennyson
 * Dr. Shueman (first appearance)
 * Steve Cummings (first appearance)

Villains

 * Zs'Skayr
 * Monster Trio
 * Dr. Viktor (first appearance)
 * Yenaldooshi
 * The Mummy

Aliens Used

 * Stinkfly (accidental transformation; selected alien was Four Arms)
 * Snare-oh (accidental transformation; selected alien was Heatblast; first appearance)
 * Cannonbolt (accidental transformation; selected alien was Four Arms)
 * XLR8

Spells Used

 * Aquata Risa Spackwata
 * Twista Combititus

Errors

 * In the beginning when the prison on the Rust Bucket were crushing a car between them, the car was gray. When the car began to spin out of control, it became red.
 * When Ben transformed into Snare-oh, the Omnitrix's design was incomplete.
 * In one scene when Ben was battling the Yenaldooshi, the green stripe below the Omnitrix was gone.
 * When Snare-oh was walking towards the hole in the wall, the Omnitrix was gone.

Trivia

 * The Tennyson's 36th stop is Cape Canaveral.
 * This is a two-part episode, even though it contains two episodes of different names.
 * The villains from this episode are all alien versions of popular monster-movie tropes: a mummy, a werewolf, Frankenstein's monster, and a ghost.