The plot is about a girl that can travel through time by walking in a mysterious tunnel.

But she did not think that she would ever be entirely comfortable in the mysterious tunnels.

She was going to find out something about that mysterious tunnel!

Ahead of him, a robot was standing in a transparent booth, speeding along a track down a mysterious tunnel.

Narrowed his eyes into pensive slits when he heard about the laboratory and the mysterious circular tunnel.

Shana tried not to be sick, and wished she was out of there, across to that mysterious tunnel, where there weren't so many people.

The others started through the mysterious tunnel.

It was one of many mysterious tunnels.

Beyond this door there's a mysterious magic tunnel that runs straight through the house to Somebody's back-yard.

Now they were in a mysterious tunnel where there were fresh footprints.