Last appearance: Season eight, "The One With the Red Sweater"
When the group finds out that Rachel is pregnant, Phoebe mistakenly assumes that Tag is the father after finding a sweater that looks like his.
Around the same time, Tag wants to get back together with Rachel, until he finds out that she's pregnant.
He later runs into Ross, who's wearing the same sweater as him, and asks whose baby it is. But Ross thinks he's asking about the sweater label and not Rachel's child.
His last line is "Yeah," in response to Ross.