This is how Umarak finds the cure goes in Umarak's Return Part 2.
[We see Ryan spraying the protective spray on Umarak]
[He sprays it and kisses his hand]
Ryan Tokisaki: Perfecto.
[An Unknown Figure materializes to give Umarak answers]
Unknown Figure: The plague you speak of has visited us once before. A wise man was able to contain the spores and send them into the sun, but no one was able to destroy them. No one had the power to do that. The only way to fight such madness is with wisdom. Unfortunately, no one person now has the wisdom to contain the spores, much less destroy them, now that they have spread across the galaxy.
Umarak the Hunter: There is one thing.