Originalan tekst - Japanski - 「いいか、ついてきてはならんぞ！

This text is from a video game and I can't seem to translate it on my own. My reading comprehension is getting better, but by listening is not good. Without kanji, I have a difficult time reading. If you could provide me with a breakdown of each word and particle, that would really help me learn for the future. (american english)