Gallaxhar is a very brief participant in the Disney vs. Non-Disney Villains tournament. An alien warlord, he is the main villain of the Dreamworks CGI animated film Monsters vs. Aliens. He is very loyal to Kylo Ren and would not betray him.
Disney vs. Non-Disney Villains War
During an attack on Zurg, his ship was blown to bits by Zurg after a duel. The explosion sent Zurg into the cartoon universe. Gallaxhar on the other hand died in the explosion.
Non Disney Villains Tournament
Gallaxhar and Madame Gasket arrive on Earth, intent upon taking it over. They encounter resistance, however, when the "heroic" Tighten and Vector arrive to stop them. Tighten blasts Gallaxhar aside with his heat vision, killing Gasket while Gallaxhar recovers. Gallaxhar scrambles to crush Tighten with a steel pod, but Tighten tears his way through and plucks him aside. Gallaxhar has just enough time to see Vector wipe out his entire armada with a death ray.