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Kronk - Head of Security will let the player move a character with a cost of 5 or less into play for free whenever Kronk banishes a character

They aren't sacrificed or destroyed, so you can't get around it with Indestructible or not being able to sacrifice things

A single returned creature is 4 mana, two creatures is 5, and so on

This is how those target spell cards work they go on the stack after/above the cards they target, so as you work your way down the stack they will apply their effects before that targeted spell does and if their effect is to remove that target from the stack prematurely, then it will never get to resolve at all