In my view, this is the best episode of Season 4(even tied with GWH). Not only is it hilarious, it's also wonderful to see Mac and Bloo actually live up to their reputation as 'best friends', something that the writers seem to have forgotten both before and sadly AFTER the arrival of this gem.
This episode and "Neighbor Pains" are fundamentally different in that the former focused almost exclusively on Mac/Bloo and the latter was an ensemble episode, but both had some really adorable moments featuring the boy and blob duo, and I truly hope Season 5 will have more episodes like these.
It was nice to see Frankie in a bikini two-piece, but some reason, I don't love it as much as I do all her other "fancy" looks(but I still love it enough for it to be in my sig banner). I think her real highlight in that episode was, like f_f said, that mini-speech she gave to Mac at the very end.
