Lip Sync Battle on January 21, 2015 with Salt N' Pepa.

Pepa (Sandra Denton) of Salt-N-Pepa on Spike TV’s Lip Sync Battle in 2015.

*Cheryl “Salt” James and Sandra “Pepa” Denton face off against each other Thursday on Spike’s “Lip Sync Battle.”

In a new preview of the episode, Pep tackles Katy Perry’s “Firework,” while Salt busts out with Run-D.M.C.’s “It’s Tricky,” dancing more than lip syncing.

Watch teasers of both, below:

LL Cool J hosts and Chrissy Teigen provides commentary on “Lip Sync Battle,” airing Thursdays on Spike.