In this episode a cross diemension portal causes a Yu-Gi-Oh! duelsit to come to Ben's universe. He summons a dinosaur monster causing the Ultimatrix to malfunction and make Ben turn into Ben Rex. Ben then loses control and starts attacking him. The duelist sacrafices his monster to summon Ultimate Tyranno. Ben then shoots fire and destroys the monster! The duelist is so scared he activates Return from the Different Dimension and goes home. Ben then turns back into himself.
Ben reunlocks Ben-Rex
Duelist and Ultimate Tyranno
This is the 2nd episode Daggergor doesn't appear.