How would you go about creating a script where the person turns into something else such as a zombie?

How can you turn someone’s humanoid i guess? into something else like a zombie once they get hit or dies.

Vou can use something like: put script in startercharacterscripts incide starterplayerscripts with this :
If then
Body colora

This is too vague for a support request, please try to script it yourself first and come back with specific questions on small bits of code that you get stuck on.