After Molly finds out from her doctor that she is healthy and fertile, Mike starts to worry that he may be the reason why they're not pregnant yet. Carl tries to convince Mike to go get his sperm checked, but Mike refuses. After Mike finds out that his Dad had a low sperm count though, it sends him running for the fertility clinic, afraid that Molly will leave him if he can't give her a baby. Meanwhile, Vince tries to earn his keep by becoming a door-to-door vacuum cleaner salesman.