The Thrillerz is a Zombie variant of Those Guys. It moves significantly faster, burrows twice and revives with 100% HP once. It acts as a barricade for meatshields similar to Znache.
Their low HP and Single Target make them very easy to dispose of, for the most part. Li'l Flying Cat and other units that deal AoE damage can easily neutralize them. Be wary of their double burrow, as it gives them to opportunity to sneak up to your back line and possible leave a dent in it before they are defeated.
They can be used as a very effective stepping stone for Slime Cat.