But if the tag seems a little steep for fans, you can't put a price on meeting in the flesh the stuff of childhood fantasies, be they sci-fi or sigh-fi. Face it, every guy in his mid-30s would have paid a million dollars in 1980 to spend a few minutes in the company of Colonel Wilma Deering of Buck Rogers in the 25th Century. Seriously, 20 bucks? Holmes, that is a bargain. Alas, that estimable heroine of futures past, Erin Gray, is probably not the hottest draw at the Dallas Comic Con and Sci-Fi Expo this weekend. That honor would probably fall to Marina Sirtis of Star Trek: The Next Generation or Billy Dee Williams, whose turns in Lady Sings the Blues and Brian's Song and The Bingo Long Traveling All-Stars & Motor Kings will likely be overlooked by those con-goers wanting a tiny piece of Lando Calrissian during his Saturday stint doling out expensive autographs. Also attending are Buffy and Angel regular Julie Benz, Dean Haglund of The Lone Gunmen and Robert Picardo, the holographic doc from Star Trek: Voyager--fine guests all, but none possessing the iconic status of Erin Gray, star of Silver Spoons and Buck Rogers and damned near every other TV series that aired from 1980 to 1990. In this battle of the network stars, she is the clear winner.