Two is always better than one
Opening 2 Version 2: Limit-Break x Survivor by Kiyoshi Hikawa
Ending 10: 70cm Shiho no Madobe by RottenGraffty
This Time: The remaining Universe 2 fighters fuse into a new super warrior, one so powerful that it may take every single remaining Universe 7 fighter to take it down.
NOTES: This is actually a personal favorite of mine. It's the first episode of the tournament where we get to see the entire group team up, which is always cool. Anyways, no spoilers!