Klingons and time travel and “Starship Troopers,” oh my. It’s time for the fifth annual COSine science fiction convention, Friday through Sunday in Colorado Springs. The guest of honor at the convention is science fiction author Mike Resnick. One of the most popular and prolific sci-fi authors working today, he’s written 81 books of science fiction, according to his Web site, and has been nominated for 30 Hugos and 11 Nebulas. These days, he’s specializing in short stories; his “Kirinyaga” series of stories is his most acclaimed work. He’s also a regular on the fandom circuit, serving as the guest of honor for at least 35 science fiction conventions before he arrives at COSine. COSine organizers say the local convention has a more literary focus than many others — with authors Wil McCarthy, Connie Willis, and Sarah and Dan Hoyt joining the lineup — but it doesn’t end there. The convention offers programs and panels for adults and kids, and there are sci-fi dealers, a video room, bring-your-own-gaming, art and animé. Eric Schwartz, publicity chairman for COSine, said he expects about 120 fans for the festivities. It will serve as a warmup for the massive sci-fi event landing in Denver later this year: Denvention 3, the 66th World Science Fiction Convention in August, is expected to draw about 5,000 fans. “It’s a real big deal,” Schwartz said. Find out more online at denver2008.com. COSINE SCIENCE FICTION CONVENTION When: 3 p.m. Friday, 9:30 a.m. Saturday, 9:30 a.m. Sunday Where: Best Western — The Academy Hotel, 8110 N. Academy Blvd. Cost: $45 for entire weekend; $10 for kids ages 5-10. Info: Go to www.firstfridayfandom.org/cosine, e-mail cosine@rialto.org or call Jack Heneghan at 488-0773.