Frank’s Cool Holiday (S02E10)

Casper, Frank, Iben, and Mia are headed out for a vacation, but after an argument, the girls decide to drive to the summer cottage by themselves. Meanwhile, Frank and Casper pick up two young hitchhikers along their journey. Unfortunately, Frank gets stung in the groin by a lion's mane jellyfish, leaving him unable to take advantage of Mia's ovulation window.