Season 5
Season 5|Episode 8 'Barely Legal'
its on season 4
Season 4|Episode 27 "Griffin Family History"
In the US Season 5 (UK Season 6) episode 'Barely Legal', Brian accompanies Meg to the prom because she had nobody else to go with. This was also the episode with the first 'Cool Whip'!
"Patriot Games" Season 4: Episode 20
Season Five|Episode Eight Barely Legal
It is called "Barely Legal"
Season 5 | Episode 8 | Barely Legal
Season 5|Episode 8 'Barely Legal'
Season Five|Episode Eight Barely Legal
Season 4
Season 6, Episode 8. (it's the eighth episode in the season)
Season 7|Episode 8 Family Gay
If you're American, it's season seven; if you're British it's season eight. The episode's called 'Family Gay'
Season Three|Episode Two Brian Does Hollywood
It is season 5 episode 5
Season 4