Ok it was a really lousy kids movie although not animated- used to appear during the school holidays on mnet.
Young kid falls off rollerskates and goes to hospital where he discovers he has x2 of every organ- 2 hearts - 4 lungs.
Turns out he is from another planet -
Only other scene I can remember is a microwave becoming a forcefield
Ring any bells to anyone?
Were probably talking 1995 here