I'veI saw a cartoon movie as a child in the late 80s I barleybarely remember.
In the movie there was a bad guy (a wizard maybe) and a team of heroes that traveled to defeat him. The movie had a fantasy (medieval?) theme. One of those heroes was a eagle human. When they fought against the bad guy the eagle human tried to attack and was thrown (cooked?) in a big cauldron.
The actual hero of the movie was a man that looked like three men triangularly stitched together. It appeared not before the end of the movie where he kicks some ass and the good guys winswin. I think the movie was named after the actual hero.