The Textbook Definition of Underrated.
Sandy's Rocket is easily one my favorite episodes of Season 1, and used to be my 7th favorite episode of the entire series. An episode where SpongeBob and Patrick go into space, mess it up, and then go alien hunting?? This is one word, and one word only: EPIC. I love the gags when they're in space, they make a lot of witty remarks, and once again, SpongeBob is naive to Patrick. It's really great. Them messing around with the ship is also so funny and actually really cool.
And then the alien hunting, oh man do I love it. Them thinking everyone is a space alien is just so cool, and makes sense cause they think they landed on the moon. They get a lot of good gags with catching the characters, and it is just awesome. And then when they catch Sandy, it is so great. Patrick being caught is SO funny to me. SpongeBob being naive is really funny, and it's interesting to see where it all goes. The ending where he actually lands on the moon is also very funny.
I don't get why people dislike this episode, it feels kinda different for Season 1, like SB-129 kind of, really cool. This episode is awesome: 9.5/10 for me.