Phil takes the family to Australia, in attempt to connect with his late mother, whereas the others have plans to explore the country in their own ways.
The fifth season had two travel episodes, called "Las Vegas" and "Australia". Although the former received better feedback and higher ratings, the latter managed to have an entertaining script with fun comments during its intervals.
"Australia" introduces more family troubles and atrocities. Jay and Claire want to work instead of enjoying their trip; Mitchell and Cameron find out that their friend is a famous talk show host; Luke and Manny attempt to seek topless women at Bondi Beach; Haley try to teach Lily a lesson about buying a souvenir; whereas Gloria barely keeps Phil alive after his attempts of being a real "Aussie".
Phil's attempts to belong in the Australian society, Mitchell and Cameron's moments of fame, Alex' attempts to sound professional in a traveling review, and "Crocodile Dunphy" are merely a few notable moments in the episode.
Is it the best episode in terms of story? No. Is it worth re-watching tens of times? Certainly.