Hot Heads is the 11th episode of Tenkai Mixels.
When both Guren and Magnifo have a cold, Gen and Flain must work together and mix. But there's one problem: they can't get along well for Flain thinks that Gen is a jerk while Gen describes Flain to be hot headed knucklehead!
Flain: I can't mix with... (points at Gen) HIM!!!
The sneak peek show us the mixels don't know about sickness, but like Flain, Glomp knows about humans sickness.