A/N: OK, this is not technically a Christmas song. The tune is Beethoven's Ode to Joy, but the hymn begins, "Joyful, joyful, we adore thee," which inspired this.
Natasha's Speech
Banner, Banner, I adore you
But we need the Hulk today.
Ultron's plan is clear before you
Now's no time to run away.
People need us. Battle's raging.
Please don't try to raise a fuss.
Hulk can be the one to save us.
You just need a little push.