A musical that was a little like a visit to the circus, a wacky adventure and a fantasy story with cosmic overtones — all rolled into one — was previewed Thursday at the University of Oklahoma. “Seussical the Musical” was also a little bit like a rollercoaster ride, performed in less than 90 minutes with no intermission, at OU’s Rupel J. Jones Theatre, 563 Elm Ave. But if the production sometimes seemed to be trying to do too much in too short a time, it did succeed in delivering a touching as well as adventurous “story of friendship for the young and the young at heart.” Also contributing to its effectiveness were kaleidoscopic projections, colorful backdrops and costumes, and delightful song-and-dance numbers, performed with great energy by OU cast members. Jamie Goldman got the manic ball rolling in the musical by Stephen Flaherty and Lynn Ahrens, based on the stories of Dr. Theodor Seuss Geisel, bringing just the right madcap flourish to the “Cat in the Hat.” In his eye-catching striped topper, Goldman led the company, and a boy named JoJo, well played by fifth grader Campbell Walker Fields, in a paean to the imagination called “Oh, The Thinks You Can Think!” Heartfelt and understated, by contrast, was Brett Uram as Horton, who finds the People of Who living on a tiny planet in a piece of clover, and takes over a flighty bird’s job of sitting on an egg in her nest in a tree. Stolid and slow-moving rather than charismatic, Uram got across Horton’s steadfast, elephant-like loyalty, while singing that we’re “Alone in the Universe” and “A person’s a person no matter how small.” Alexis Bruza nearly stole the show as Gertrude, a bird who finally gets more than one tail feather, but still can’t get Horton to notice her, until she goes to heroic lengths to help him in his self-assigned tasks. Handling their parts with panache were Sophie Menas as the “amazing” bird Mayzie, who deserts her egg for the beach, and Kate Dinsmore as the biker-like Sour Kangaroo, conversing with her own biker doll. More show business pizzazz came from Audra Bryant, Claire Avakian and Brooke Lacy as a chorus of bird girls, and Jamard Richardson, Dan Horn and Ethan Kahn as the jiving Wickersham brothers. Andrew J. Koslow and Chelsea Stavis conveyed fussy neatness of dress and manner, coupled with a hint of cluelessness regarding “How To Raise a Child,” in their roles as the tiny town’s mayor and his wife. The production was directed and choreographed by Lyn Cramer, with Vince Leseney serving as music director, scenes designed by Andrea Pratt, costumes by Lloyd Cracknell, and lighting by Curtis Marxen. It is highly recommended — especially for Dr. Seuss fans —I n its remaining performances. It will be staged at 8 p.m. May 3-5, with matinee at 3 p.m. May 6. Tickets are $30 for adults; $25 for senior citizens, members of the military, and OU faculty and staff; and $15 for OU students. Call 325-4101 or visit the website at www.ou.edu for information.