as of March 13th 2011, 151 1/2 episodes have aired
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As far as I can Remember it is in Nature Pants when he moves into jellyfish fields with the jellyfish.
It is the newest SpongeBob movie that has been released, as far as i know, they are making new ones even as i type this answer. The latest one will come out around June 19 2010 called: Spongebob and the Clash of Triton
Well, Sandy first met SpongeBob in the episode "Tea at the Treedome". She was wrestling a giant clam, and thinking she was in trouble, SpongeBob went to rescue her, instead ending up inside the clam himself. Sandy's reaction to that seemed to be one of shock and surprise. She then yelled out "Hold on little square dude!", and proceeded to rescue the 'rescuer'. After that, they became very fast friends, Sandy going so far as to say "I like you SpongeBob" and they could be "tighter than bark on a tree'', as they talked with each other for the first time.
2011:13 YEARS2012:14 YEARS2013:15 YEARSAND SO ON!Spongebob has been on tv since may 1999
He first transforms in the episode "Upgrade to Super Saiyan", which is episode 129. Or 114 of the cut version. So far, that episode of Dragonball Z Kai has not come out.