Gavin Degraw takes the stage. The Earth is at war. Teens save the world. Ellen changes lives. There’s a lot going on this week on TV, Hulu, and Prime Video – here’s what not to miss. ________ Tuesday, December 10 Ellen’s Greatest Night of Giveaways Ellen DeGeneres and her celeb friends deliver life-changing gifts to unsuspecting strangers. Reality, NBC. Tuesday, December 10, 8pm. Special. ________ Friday, December 13 88th Annual Hollywood Christmas Parade Floats, Marching bands, celebrities, and crowds of happy families. Special, CW. Friday, December 13, 8pm.  ________ CMT Crossroads: Gavin DeGraw & Chris Young Pop-rock/soul meets classic soulful country when Gavin DeGraw and Chris Young meet on stage to jam and tell stories together. Music, CMT. Friday, December 13, 10pm. Special.  ________ Marvel’s Runaways LA teens band together to stop their evil parents before it’s too late. Drama, Hulu. Friday, December 13. Season 3. ________ The Expanse…