I Never Cooked for My Father - S1.E18

When Roger's father, Nick shows up unexpectedly, Annie tries to convince Roger that his dad probably wants to make up for lost time, but Roger can't help being suspicious of the father he has barely known. While Roger's dad is in town, Elliot moves in with Didi, but Didi immediately regrets inviting him after she excitedly appoints him her ""diet cop"" and he takes the job a little too seriously.