Fred appeared in Face Freeze!. He has been seen in many episodes at the movie theater. There is one episode where he does get hurt, but he says "my leg" in a dull tone, implying that he has sustained enough injuries to not feel the pain.
"Rev up those fryers, 'cause I'm sure hungry for one...... HELP!!! HELP!!! MY LEG!!!"
"Thanks for the lies, Mr. Fairy Tale!!"
"Monster Krabby Patty?!"
"But let's not forget about the real composer, Squidward!"