it was released on December 14, 1985 and Bubble Bobble was released in 1986. Fukio Mitsuji might see that episode and model Bub and Bob after it.
some screenshots:
Gummi Bears was broadcasted in Russia in 1991-1992. i discovered Bubble Bobble on ZX Spectrum in 1992-1993, and my first thought was that the game is based on that cartoon!! i even wrote it down in my Bubble Bobble instruction set for ZX Spectrum (in 1993):
if anyone is interested in watching that particular episode, PM me, i will provide the link to DVD-Remux.