Project Grizzly Bear trainer Jeff Watson is almost ready to release his two raised-in-captivity grizzlies into the wild in this documentary series’ first-season finale. 10 p.m. Animal Planet
Saturday Night Live Casey Affleck (“Manchester by the Sea”) hosts, and musical guest Chance the Rapper performs. 11:29 p.m. NBC
A Pentatonix Christmas Special The a capella group is joined by guests Dolly Parton, Reba McEntire and original “American Idol” Kelly Clarkson in this encore special. 8 p.m. NBC
I Want a Dog for Christmas, Charlie Brown! The Peanuts gang...