Season 13, Episode 4 - Queen's Gambit
Penny is put out when Michael is completely distracted by a job interview, as she needs him to write her annual report.
Ollie mishandles a terminal case, underlining his own repeated unprofessionalism. Elliot, while appalled at the full extent of Ollie's immaturity, covers for him.
Donna meets an attractive new agency nurse, Kieran. After an initial spark, things go downhill as Donna becomes suspicious of his laddish ways.