I thought this was a good episode! Granted it was pretty weird and bizarre by SpongeBob standards, but that's what I loved here. The idea of SpongeBob and Patrick flying their brains was definitely a fun, fresh, and highly unexpected plot, Squidward was hilarious, and I like how Sandy was in this episode. Plus, I literally gasped when Mr. Krabs and Mrs. Puff were shown dating in this episode! Could that mean SpongeBob is beginning to follow continuity?! And Ed Asner did a good job voicing the old man, who was an interesting new character. There were some jokes that put me off like Patrick wearing a diaper as a brain (gross!), but otherwise this was just a fun, weird episode overall. I can't wait to see what new direction season 10 will bring our favorite sponge to, because I'm loving it so far! 8.5/10
By the way, has anybody noticed how different the animation is for this episode? Compared to season 9, this episode seems to have thicker, more organic outlines and the character movements were kind of off, kind of like most season 2 episodes. Not to say it's bad, but it totally caught my eye.