The Twilight Zone - Little Girl Lost

When he hears his young daughter Tina calling out in the night, Chris Miller go to her room but finds she isn't there. At first he thinks she fallen off the bed or slid herself under it but despite hearing her call out she's nowhere to be seen. He gets help from a friend, Bill, who concludes that Tina has slid through a portal into another dimension. They find the portal opening but Tina is lost inside and Chris goes in after her