Giygas- Rift in Dimensions

“...Well, anyway,” Jeff thought aloud while steering with his knee and slurping noodles (talking to himself while he thought was a habit of Jeff's), “both that large man and Tessie...they seem to be creatures that were supposed to have gone extinct a very long time ago. Apparently, Tessie began to appear only recently. And I've never seen anything like that large, kind-hearted guy, even on TV. I wonder where they've been hiding all this time...” He paused, and then a look of sudden realization crossed his face. “Oh, I know! He seemed to know Tessie pretty well. They must both have come from the same place...wherever that place may be.”
	And if so...he didn't think it was the kind of place that could be reached by any ordinary means, be it walking, driving, or swimming.
	“A rift between the dimensions, maybe?” Jeff muttered, furrowing his brows. “Parallel universes, a disruption of our timeline, unknown invaders, genetic engineering, like in Jurassic Park? ...In any case, something very unusual is going on! And if something unusual is going on, then those two probably aren't the only ones who suddenly turned up around here. ...What if there are others? ...Huh?”

- MOTHER 2: Giygas Strikes Back, chapter 4