Zackie Peng is a variant of Jackie Peng, that is a Zombie enemy. Like most other Zombie enemies, he can burrow and revive once. However, Zackie is single target, making him useless if he burrows into an area with a lot of meatshields. Beware if he is spammed, however, as this fixes that initial problem.
A penguin who somehow still feels a hole in his heart even after fulfilling his goal of breaking into Hollywood. Shows up in a lot of action scenes due to having a light body and heart, but he only ever gets offers for zombie films.