Ok, so water bears didn't seed earth, but could we use them to seed other planets with life?

Captain Tardigrade, the water bear who cares.

One of the first things I messed around with in my first year of Ecology.

Another toughie are the Hydra, a genus that not only has remarkable regenarative properties, but also don't seem to age. Ie, they appear to be biologically immortal. They aren't quite as "cute" as the water bear though, they are basically jellyfish with a very simple nerve net that provides some basic behaviour that allows them to feed...and not much else.

That's a pretty extreme accent on the narrator. Almost extreme as the water bear.

I had an uncle who was mauled by a microscopic water bear.