Man, Thundercats was my favorite show when I was a kid, I thought it was the best shit ever. Then I got the DVDs of the first two seasons a couple years ago, and I sadly realized how lame it was. The shows are unintentionally hilarious now in how cheesy they are.
I also think Mumm-Ra was one of the worst villains ever, though. He got his ass kicked every single episode by a bunch of cats (and sometimes even by minor characters or lesser villains), but then he just laughed and said "mwa-ha-ha, I'll be back". Back for what? To get your ass kicked again? The ever living source of evil should have more balls, even for a kids show.
Also: That outtakes video above made me laugh my ass off!