ThunderCats Roar (2020)

S1E14 Dr. Dometone

Lion-O embarks on a mission to chart the coastlines of Third Earth, but inadvertently ends up depleting the oceans completely. Oops! Fortunately, he encounters a peculiar scientist accompanied by a robotic frog, who claims they can resolve the disaster by journeying beneath the surface. This wild escapade is exactly the sort of thrilling challenge that excites Lion-O.