R. L. Stine’s The Haunting Hour Season 1 Episode 13 123movies

A mask tells of a very bad past, so Julie (Madison Pettis) and Bill (Ricardo Hoyos), set off to change the past of the kids who they believe died. Robbie was the only one to see a creepy man in the room who presumably killed them. In the end, the kids seen through the mask were actually Julie and Bill. The man they believed would kill them was just the handyman of the abandoned house who was trying to fix the furnace, and the mask enables their friend Robbie to save him when an explosion in the furnace causes the beam they thought would crush them to fall on him. Robbie shoves both himself and the handyman out of the way. They realize the mask shows the future instead of the past.