Still, expect large crowds for that panel, as well as fellow BBC America series “Torchwood” and “Being Human.”
And speaking of intergalactic sci-fi, actor Callum Blue will lead the “Smallville” panel as the town prepares for the arrival of his General Zod.
Sunday’s a short day, so make the most of it.
Some highlights from Sunday (all times are Pacific):
10-11 a.m., Ballroom 20 — David Tennant makes his first Comic-Con appearance, as well as his last as Doctor Who.
10:30-11:30 a.m., Room 6BCF — Kneel before Zod! Actor Callum Blue, plus the showrunners and some cast from “Smallville” will talk about the new villain’s reign.
11:15 a.m.-12:15 p.m., Ballroom 20 — The folks behind “American Dad” show the stages of a typical episode’s production.
11:45 a.m.-12:45 p.m., Room 6BCF — Okay, Jared and Jansen won’t be there, but other “Supernatural” cast members will talk about the coming fifth season.
Noon-2 p.m., Room 24A — “Firefly” is still going strong after cancellation: The California Browncoats invite their fellows to stop in and celebrate the series.
1-2 p.m., Room 6BCF — Meet Jennifer Love Hewitt and her talents at the “Ghost Whisperer” panel.
2:15-3:45 p.m., Ballroom 20 — John Barrowman’s “Torchwood” panel appearance from last year was one of the show’s best: Catch him again this year and then a panel for BBC America’s “Being Human.”
4-5 p.m., Ballroom 20 — Sing along to a screening of the “Buffy the Vampire Slayer” musical episode “Once More with Feeling.”