This Alien reappeared in the film Mega Monster Battle: Ultra Galaxy Legend The Movie.
In the film, Alien Zarab (as Imitation Ultraman) attacks two guard ultras and frees Ultraman Belial from his prison. After revealing his true identity, Alien Zarab gives Belial the Giga Battle Nizer in hopes of the two forming an alliance. Instead, Belial betrays and kills Zarab and heads to M78 to attack the other Ultramen.
It's unknown if this Alien Zarab is the same one that appear in Ultra Galaxy NEO or if this one is a different one of its kind.