The Time Zoey Cheated on Mike With Trent
After the season ended, Mike and Zoey realized how annoyingly boring they both were. Mike took his time off between Seasons Four and Five to reflect on why he was so boring and how he could develop himself without Zoey. This upset Zoey and was not helped by the fact that Zoey was on her period. So she went home to change her clothes and go to the mall.
When she got to the mall, she met Trent, who she instantly developed a crush on. They talked and Zoey realized that this was who she was. She was a strong, independent white girl who didn't need no Mike to take care of her. Then she had sex with Trent and got pregnant and had nine of his babies.
Mike got depressed and began dating Sierra because she wouldn't take "no" for an answer.
And then they all died. The end.