Ben 10 Vol 9 - The Visitor

Some major baddies are back — Ghostfreak, Alien Mummy, and Alien Werewolf — and they
plan to shroud the Earth in darkness with a special diabolical beam from outer space (The Return, Be Afraid of the Dark). 

Baseball season brings Ben, Gwen and Max to the Little League World Series - but these kids are really robots trying to kidnap the President (The Unnaturals)! Finally, in The Visitor, Max meets up with an old girlfriend, Xylene. But Xylene just happens to be an alien! In a battle with Vilgax’s robotic drones, Xylene helps Ben unlock another new alien hero - Upchuck!