Scene-stealing

The Pied Piper (20th Century-Fox) pipes sumptuous Monty ("The Beard") Woolley out of his wheel chair for the first time since he began playing The Man Who Came to Dinner (TIME, Jan. 26) three years ago. The change is good for him. The belligerent old nanny goat turns into a very human portrait of a crotchety, kindly Englishman caught in France by the Nazi invasion. But kindliness does not prevent elegant Actor Woolley from walking off with the picture against the trying competition of six scene-stealing children.

Source: wiktionary

They are also very sympathetic, especially Caesar's orangutan advisor, Maurice (Karin Konoval), who takes a shine to a human moppet (Amiah Miller) he finds hiding in the back of a shack, and the poignant Bad Ape (a scene-stealing Steve Zahn), a mangy chimp who was beaten so often in his zoo-animal days that he came to believe what his handlers were shouting was supposed to be his name.

Source: wiktionary