Ben 10: New Crisis

Ben 10: New Crisis is the fourth Ben 10 series. In this series, Ben, Gwen, Kevin, and Julie go to college and Ben stops using the Ultimatrix but when new alien threats emerge, Ben puts on the Ultimatrix again and gets his friends' help, but receives an unexpected upgrade and an unexpected new enemy.

Episodes:

 * 1) Return of the Ultimatrix: Ben, Gwen, Kevin and Julie have all become college students and try to look forward to a normal life, but when they are attacked by their old enemy Hex, the gang must go back into Plumber business and Ben puts the Ultimatrix back on, but gets an upgrade that allows all aliens he transforms into to become their ultimate forms permanently. New Ultimate Aliens Unlocked: Ultimate Jetray, Ultimate Rath
 * 2) Awkward Conversation: When Kevin accidentally sees Gwen naked after he accidentally goes into the girls' locker room, they could be on the verge of breaking up. But when Vulkanus comes back with a weapon that threatens the existence of the Ultimatrix and the world, Gwen and Kevin must make up and forget the embarassing memory that threatens their realtionship. New Ultimate Aliens Unlocked: Ultimate Spidermonkey, Ultimate Lodestar
 * 3) Here's Ghostfreak!: After Ben watches a scary movie, he develops a fear of the dark, causing him to be humiliated by Kevin. He starts hallucinating that his old enemy Ghostfreak is coming back to haunt him, but it turns out the hallucinations are real as Ghostfreak targets Ben once again to possess his body and take the Ultimatrix. New Ultimate Forms Unlocked: Ultimate Heatblast
 * 4) Double Trouble: Albedo returns and decides to take revenge on Ben by impersonating him and making him look like a criminal. When Albedo captures Julie and threatens to kill her, Ben must make a choice to help Albedo return to his real form or have Julie's life end at his hands. New Ultimate Forms Unlocked: Ultimate Chromastone, Ultimate Brainstorm (by Albedo)
 * 5) Fight to the Death: Slix Vigma returns and kidnaps Ben and Kevin as they were past gladiators of his. When Ben and Kevin refuse to fight each other, Slix brainwashes both of them to do so using mind-control headbands. Gwen and Julie sneak onto Slix's ship to free them, but they must fight them in order to save them. New Aliens Unlocked: Ultimate Water Hazard