Common theme in 70s/80s kids TV was “Here’s the weird alien/monster who turns out to make an awesome friend if you just give him a chance”
Sigmund and the Sea Monsters was one of those 70s Sid and Marty Kroft shows they played non-stop in the 80s for odd times of the day and I liked it.
Even as a kid I knew the fx were cheesy but you get over it quickly and it was watchable stuff. In retrospect though, Sigmund really had abusive parents.