The Strand Theater, 119 N. Main St., Zelienople, will show the musical "Grease" at 7:30 p.m. Friday and Saturday and at 2 p.m. Sunday. Tickets are $5 for general admission or $4 for senior citizens. Call 724-742-0400.

<B>Rangos Omnimax Theater</B> at the Carnegie Science Center, One Allegheny Ave. next to Heinz Field on the North Side, premieres "Volcanoes of the Deep Sea" on Friday. "Mysteries of the Great Lakes" and "Under the Sea" continue. Admission cost varies. Omnimax is not recommended for children younger than 3. Call 412-237-3400 for show times.