Oh, Dawn. Listen, it’s an uphill climb to be a character literally retconned into the fabric of a beloved show five seasons in. Michelle Trachtenberg bravely allows Dawn to be exactly as self-involved and bratty as a young teenage girl with a big-deal older sister would be — and like Xander, she was a normal, mortal way station on an increasingly fantastical show. Alas, she also becomes increasingly superfluous once her position as the Key is no more.