You might not think some of the world's superheroes, and at least one of its supervillains, think about such everyday tasks as saving those newspapers for recycling, conserving energy or finding ways to live a more environmentally sound lifestyle.

But such assumptions would be wrong, at least when it comes to a couple of shows planned at Norwalk's Maritime Aquarium on Saturday, Oct. 29.

The Marvel Super Heroes' "Operation Green" show, which will be staged twice that day, will feature Spider-Man, Captain America and Iron Man doing what they do best -- taking on the Green Goblin, who stops by to cause a bit of trouble, and encouraging children and their families to be heroes themselves.

"The show is about teaching kids and families about the importance of going green and protecting the environment," said Sam Ross, the aquarium's director of development, volunteers, membership and programming. "It's open to everyone ... but it's best for families with little kids who love superheroes."

This year's show follows a very successful appearance last year by Marvel's Spider-Man, who drew thousands to the aquarium. Ross said he was pleased to work with Marvel to present a fun and educational program this year.

It will be a good balance, he said, between the fun and action set for the IMAX stage, and the message of preservation and protection.

Young visitors are encouraged to come dressed as a superhero and to save some time for the meet-and-greet portion of the event, when autographs will be dispensed.

A relative newcomer to the ranks of do-gooders will be there too, the aquarium's own Captain Living Sound, who keeps his eyes on the environment of Long Island Sound, and the many creatures who make it their home. Like his colleagues, he is expected to say a few words about the dangers of pollution, as well.

"Captain Living Sound works with young people ... encouraging them to pledge to protect the Sound," Ross said. "There are things children can do, as well as their parents."

For instance, Ross said something that appears as simple as washing your car in your driveway can have detrimental effects, since polluted runoff can be carried away into storm drains, and eventually out into Long Island Sound. Another option, Ross said, would be to check out commercial car washes that have systems to treat and reuse the water.

"If we can keep these chemicals from getting in the water, it's the best thing to protect our ecosystem here," he said.

There are other ideas, too, listed on the aquarium's website, which urges visitors to become Sound Stewards.

"It's about instilling in young people a love of the environment and Long Island Sound and respect for all creatures who live there, in order to ensure that their children will have a treasured ecosystem (too)," Ross said.

The Maritime Aquarium at Norwalk's IMAX Theater, 10 No. Water St., Norwalk. Saturday, Oct. 29, 11 a.m., 2 p.m. $8; $5 for members (First-come, first-served, reservations strongly recommended.) 203-852-0700, ext. 2206, www.maritimeaquarium.org.