The Portage Theater will be Ground Zero for sci-fans this weekend when the "Sci-Fi Spectacular 7," a 24-hour movie marathon, unspools starting at noon Saturday at the Portage, 4050 N. Milwaukee.

Special guests include Frank Henenlotter, director of "Brain Damage" (screening in the marathon), and Jay Bonansinga, co-author of two "Walking Dead" movies.

The lineup:
NOON - ATTACK OF THE GIANT LEECHES (directed by Roger Corman)
1:15 pm - MATINEE (Joe Dante)
3 pm - THE HEART OF THE WORLD (Guy Maddin short)
3:05 pm - THE DARK CRYSTAL (1982)
5 pm - SOYLENT GREEN (1973)
6:45 pm - ROGER CORMAN '50s Trailer Competition
7:15 pm - DEAD-ISH (short film)
7:30 pm - BRAIN DAMAGE (with FRANK HENENLOTTER in person)
9:45 pm - CAMERA (rare Cronenberg short!)
10p m - INVASION OF THE BODY SNATCHERS (1978 remake)
Midnight - IN THE MOUTH OF MADNESS (1994)
1:45am - DARK CITY (1998)
Daylight Savings Time
4:50 am - SHOCK WAVES (1977)
6:30 am - THE LAST MAN ON EARTH (1964, Vincent Price Classic!)
8:15 am - SILENT RUNNING (1972)
10 am - IT'S SUCH A BEAUTIFUL DAY (2011)
11 am - BATTLE ROYALE (2000)

Tickets are $20 in advance, $25 at the door. Children under 12 and seniors, $10. Ticket holders may come and go at will. For advance tickets, brownpapertickets.com/event/302719