Dragon Ball Super S03E17 - Secret of the Unleashed Superhuman Water

While Monaka delivers a package to Bulma, Goten and Trunks sneak into his delivery truck and are accidentally taken to Planet Po-tau-feu where they encounter a group of space bandits are led by a teal humanoid called Gryll (グリル, Guriru) attempt to steal a key to a treasure Superhuman Water (超人水, Chōjin Mizu) from an elder named Potage (ポタジ, Potaji). By the time Vegeta and Jaco reach Po-tau-feu, they find the boys, Monaka and Potage fleeing from purple-skinned versions of Gryll's men which Vegeta dispatches. But the figures turn into a liquid that engulfs Vegeta and spits him out before assuming Vegeta's form