This is Wallenda's most dangerous challenge ever: crossing the dangerous waters of Niagara Falls.
The 33-year-old will be traveling 15 hundred feet across the raging falls, a distance longer than four football fields put together.
Hundreds of crew members have been working to prepare for the massive stunt, using a helicopter to pull guide ropes and tightening the hundreds of feet of wire to precise specifications.
A Valley couple traveled all the way out there to watch the world record attempt.
Jim Fisher says he's been a fan of the Wallendas and their stunts for a long time, and that he's been looking forward to this for a long time.
He's there with his wife, who is also excited to be there for the big event.
You can watch Wallenda's high-wire walk on ABC30, Friday night at 8 p.m.