Ted and Stella get engaged, but Ted soon learns that he doesn’t know anything about her. Meanwhile, Barney confesses to Lily that he’s in love with Robin.
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Episode Details: How I Met Your Mother Season 4 Episode 1
| Title | Do I Know You? |
| Episode | 1 |
| Season | 4 |
| Release | September 22, 2008 |
| Overview | Ted and Stella get engaged, but Ted soon learns that he doesn't know anything about her. Meanwhile, Barney confesses to Lily that he's in love with Robin. |
| Rating | 7.7 |
| Vote Count | 21 |
