Some might argue that Rick and Morty engage in mere time shenanigans—such as that whole
time freeze thing and the parallel timelines—with no time travel. But the
fourth-dimensional being with a testicle for a head does travel in time, most notably with
that E = mc² bit at the end.
Okay, listen you two: We froze time for a pretty long time, so when I unfreeze it, the
world’s time is gonna be fine, but our time is gonna need a little time to, you know,
stabilize.