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Places that a portal will link to include a different spot in the same universe (in which case it might be an alternative for teleportation); a parallel world (inter-dimensional portal); the past or the future (time portal); and other planes of existence, such as heaven, hell or other afterworlds.
His mistrust leads Leo to spy on Chris and find out that he has the ability to create a time portal (though not able to control it) where he and Chris are stuck (risking to be eaten by dinosaurs and captured by Confederate Americans who take them for Yankees) because of him.