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 Vicktor in his true form. Following a losing battle, the Tennysons split up: Max and Gwen board the space shuttle that Doctor Vicktor launches and Ben follows Vicktor as XLR8. The mummy's onboard the space shuttle, and Vicktor sends the werewolf to New Mexico in a flash of purple lightning through use of a teleportation device. But as Ben confronts Dr. Vicktor, the scientist reveals that he is not carrying out his own plan. Vicktor revives his master: who to Ben's horror, is revealed to be, Ghostfreak.

Major events

 * Ben and the gang encounter the alien werewolf and mummy again.
 * Ben first meets Dr. Vicktor in person and in his true form
 * Ben first transforms into Benmummy.
 * Zs'Skayr (Ghostfreak) is revived by Dr. Vicktor.

Debuts

 * Dr. Vicktor

Omnitrix alien debuts

 * Benmummy

Spells Uses

 * Twista Combititus

Characters

 * Ben Tennyson
 * Gwen Tennyson
 * Max Tennyson

Villains

 * Escaped Prisoners
 * Zs'Skayr
 * Dr. Vicktor
 * Yenaldooshi
 * Mummy

Aliens Used

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

Trivia

 * The Tennyson's 36th stop is Cape Canaveral (but it was not an intentional stop. (They only went to Cape Canaveral because of the purple lightning).
 * Most of the aliens used in this episode were accidental transformations. There was only one case when he became the alien he wanted; this was when he turned into XLR8.
 * Ben had 3 accidental transformations in this episode, meaning that this episode has more accidental transformations than any other episode.
 * This is a two-part episode, even though it contains two episodes of a different name.
 * The villains from this episode are all alien versions of popular monster-movie tropes: a mummy, a werewolf, Frankenstein's monster, and a ghost.