Rook meets Kevin for the first time, leading to some fun chemistry between Ben’s old partner and his new one.

Watch the official clip where Gwen and Kevin make their grand return to help Ben and Rook:

The conflict escalates until Looma's father, Warlord Gar, arrives with a fleet of warships prepared to attack Earth if the marriage isn't settled. Featured Aliens

Looma claims that Kevin is her betrothed and is determined to marry him—by force if necessary. This leads to a series of comedic and action-packed battles involving:

Episode 12 of Ben 10: Omniverse is titled . It is a fan-favorite episode as it marks the first reunion of the "original trio" since the series began, bringing Gwen and Kevin back into the fold after they initially left for college. Plot Summary

Used to help moderate the peace treaty and combat the warlord's forces.

To save Kevin from the marriage, Ben must face Looma in a duel, eventually realizing that by defeating her, he has technically won her hand in marriage according to Tetramand tradition.