This post is a blast from the "Veronica Mars" past, as Alison MacInnis (Dana, Lightspeed) appeared briefly on the teen detective series during it's very first season. MacInnes portrayed Shelly in the third episode, "Meet John Smith." Shelly is the newest girlfriend of Duncan Kane, the ex-boyfriend of Veronica Mars. Shelly appears in only one scene where the two are making out, until Duncan begins to imagine Shelly is Veronica, leading him to call Shelly by his ex-girlfriend's name. Luckily for Duncan, she doesn't seem to really notice.
Season 1 of "Veronica Mars" is available on DVD