Goodbye and Good Riddance

Goodbye and Good Riddance is the fifty-second and final episode of Ben 10. It is the season 4 finale and the series finale of Ben 10. This episode happens in an alternate timeline.

Plot
Ben returns home after summer vacation ends and is told that he must keep the Omnitrix a secret. This is made all the more difficult by Ben's fellow classmates who admire Ben's alien heroes while completely oblivious to Ben being them. Initially disappointed, Ben gets the chance to use the Omnitrix when Vilgax attacks, looking to take the Omnitrix from Ben. All four Tennysons (Ben's father helps) fight off Vilgax's drones running among in the city. When Vilgax appears again, easily fending off Ben, Ben's father suggests leading him into the underground gas line, which they ignite to incinerate the villain. Ben's secret is revealed to the public and Gwen ends up transferring to his school. Just when it seems like everything is quiet, Dr. Animo shows up with a mob of mutated animals, which Ben and Gwen get ready to fight.

Debuts

 * Carl Tennyson
 * Sandra Tennyson
 * Ben's Dog

Characters

 * Ben Tennyson
 * Gwen Tennyson
 * Max Tennyson
 * Carl Tennyson
 * Sandra Tennyson
 * Cash
 * JT
 * Jamie
 * Principal White
 * Ben's Dog

Villains

 * Vilgax
 * Vilgax's Drones
 * Dr. Animo

Aliens Used

 * Wildvine (off-screen transformation)
 * XLR8 (x2)
 * Diamondhead
 * Cannonbolt

Trivia

 * If you listen closely in the scene when the kids run from Vilgax's robots in the gym, one kid sounds like Cooper screaming.
 * Just like Gwen 10, Goodbye and Good Riddance is non-canon, it is just another "what if" episode, which was revealed in the Ben 10: Pop-up Edition.
 * Despite the fact that Goodbye and Good Riddance is non-canon, Gwen and her family do live in Bellwood in the main timeline.
 * Even though Cash and JT appear, they do not give Ben a wedgie, but Ben gave them a wedgie.
 * Many of Ben's alien exploits are mentioned by Ben's classmates, such as Heatblast's burning building rescue (Washington B.C.), Fourarms fight with Kevin on top the Golden Gate bridge (Framed), Wildmutt's battle with Hex in Las Vegas (Tough Luck), Wildvine's battle with Sublimino (Midnight Madness), and Diamondhead at the Little League World Series (The Unnaturals).
 * The music played when Diamondhead is fighting Vilgax's drones is the same music in Ben 10 Protector of Earth.
 * Goodbye and Good Riddance is currently the last non-canon episode in the Ben 10 Franchise.