“megastunts — highwire over niagara falls live!” (9 p.m., abc): We expect gasps

“megastunts — highwire over niagara falls live!” (9 p.m., abc): We expect gasps to emanate from living rooms all over America during “Megastunts: Highwire Over Niagara Falls - Live!” It’s a special offering coverage of daredevil Nik Wallenda’s attempt to walk a tightrope across the falls — a feat that had been banned for more than a century.

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