“Warehouse 13,” the science-fiction series that kicked off the rechristened Syfy, was a little cheesy and not very original but I liked the characters and enjoyed the premise. . . and I wasn’t alone as it caught the attention of a large cable audience. The show about two Secret Service agents who chase paranormal material for a warehouse in the middle of South Dakota was Tuesday’s most-watched show on cable with 3.5 million viewers. It reairs Friday at 10 p.m. and also available on Hulu.com.