Cain is best known for playing Superman/Clark Kent on TV's "Lois and Clark," and for serving as host of "Ripley's Believe it or Not."
His latest project is to air on Syfy Saturday night.
In it, he and a team search for a 19th century shipwreck off the coast of Antarctica.
"After the team digs up an alien ice creature that has been buried in the ice for over 200 hundred years, the creature kills the explorers and heads to the mainland, where it begins sucking the heat energy from Earth," the network said in a news release.
"Frost Giant" also stars Lucy Brown from TV's "Primeval."
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