R5
I really hope they end up making an appearance on the show before it ends.... I know some people have said that won't work but it totally would.
On ANT Farm, The McClain Sisters appeared. The other two sisters appear as a touring trio where their "third" is sick so Chyna Parks steps in as their third and performs with the. Also goes on tour with them.
R5 could come on the show as a fake band and their "fifth" is out sick so Austin performs with them.