Villains: The Chameleon and the pirate ghost. (edit) Title pictures:

When Worlds Collide: The Chameleon standing on a doorstep dressed like a bee and holding onto a trick-or-treat bag.
The Ghost Ship of Aberdeffia: The pirate ghost flying around his ship. (edit) This marks the first episode Atomic Betty wore her costume on Earth. (edit) When they look at the old photo of the ghost captain & his wife, he already looks like a skeleton. This means either he was already dead but she loved him anyway (weird couple), or he is of a skeleton-like species that can separate parts at will (he takes his skull off to kiss Sparky while he is disguised as his wife). (edit) This is the Halloween Special. (edit) In "When Worlds Collide", Noah and all the other kids of Moosejaw Hights now know about Sparky, X-5, and the Galactic Guardians! However, they think it was all made up for the sake of Halloween, so, in reality, Betty's secret still remains safe. Also in the "Ghost Ship" episode, Betty tells of her adventures in space, using the alias name "Atomic Betsy". (edit)

Penelope: What happened to the ghost? ... I mean, as if I care! (edit) Camp Counselor: Penelope certainly has an eye for the grotesque.
Betty: And a face to match. (edit) Betty: Why would anyone want to steal a brain?
X-5: The Scythian President offended Maximus by calling him a villain, when everyone knows he's a SUPER-villain. (edit) Scythian General: You have five seconds to capture him or we open fire!
(Laser fire starts striking the ground)
X-5: Technically, that was only 3.4 seconds... (edit)

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Episode Title: The Ghost Ship of Aberdeffia
This is a spoof of the Star Trek: Voyager episode, "The Haunting of Deck Twelve." (edit)