Jennifer Nocturne

Jennifer Nocturne is a minor character from Ben 10: Ultimate Alien. She was introduced in Hero Time, and briefly served as a new love interest for Ben and a potential rival for Julie and at the ending of the episode, Gwen.

Appearance
She has long blond hair. Her wardrobe changes gradually. She was once wearing a violet dress with a black sash, a red dress, and then in a black shirt with a purple jacket and white shorts with black heels.

Ultimate Alien
Jennifer Nocturne was introduced in Hero Time, as a rich and famous teenage actress playing in a vampire movie named, "Darkfall" (an obvious parody of the real-life best-selling novel Twilight). As she visited Bellwood, she was the target of a faked kidnapping attempt organized by Captain Nemesis in order to save her and raised his image in the media. After Ben interfered and stop the kidnapping instead of Nemesis, Jennifer revealed herself to be a fan of him, and kissed him in public. This was immedialty called "the romance of the century" by the media, and Ben agreed to past time with Jennifer, as according to her agent, this would be good for publicity.

Of course, this event quickly caused Julie to become jealous, despite Ben's insistance on the fact that him and Jennifer were "just friends" and he and her weren't truly dating. This jealousy grew ever worst when Jennifer invited Ben at Captain Nemesis' party and came to take him in a helicopter.

During the hero contest between Captain Nemesis and Ben, Jennifer was taken by Will Harangue as a guest correspondant to supervise the competition, during which she scolds Ben's alien form Rath for ambushing Captain Nemesis after he beats Rath unfairly in one of the tests. Ben stated that Rath tends to get carried away

Later in an attempt to get his revenge on Ben, Captain Nemesis intercepted Jennifer's helicopter and kidnapped her. When Nemesis attempted to force Ben to rescue only Jennifer or Julie, Ben saved Julie, while Kevin and Gwen took care of Jennifer. After Nemesis was defeated by Ben, Jennifer attempted to flirt with Kevin, but was quickly stopped by an angry Gwen who threatened to "peel her like a grape".

Trivia

 * She could be a parody of Kristen Stewart (the actress who played Bella Swan in all the recent Twilight movies).
 * She was mentioned in Hit 'Em Where They Live when a reporter asked Ben "Are you dating Jennifer Nocturne?"
 * She is voiced by Tara Platt, wife of Yuri Lowenthal (the voice of Ben 10), Yuri obviously invited Platt to voice Jennifer as a husband-to-wife invite.
 * Her last name could be a reference to Twilight, which has a heavy base on night themed plot points.