look, I know this is already been done, but the other ones were locked.
just do this...
Title: Ben 10: Ultimate Fusion
Plot: Ben is now 18. While fighting Vilgax, Vilgax shot a beam that overloaded the Ultimatrix. Then, Azmuth appeared and fixed it, saying,"Trust me, it is better than before." This was because the Ultimatrix, which Azmuth renamed the Fusiontrix, can now fuse any alien DNA Ben wants it to. He can still use the normal transformations, and the Ultimate forms. Then Ben transformed into Heatblast/Goop, and defeated Vilgax.
tell me if you like my idea!