It's a Big Bang Theory rap battle as co-stars Mayim Bialik and Kunal Nayyar go rhyme for rhyme, while High School Musical princess Ashley Tisdale challenges Nick Lachey to a battle you never knew you wanted.
| Name | Type | Role | |
|---|---|---|---|
| Kunal Nayyar | Guest Star | ||
| Ashley Tisdale | Guest Star | ||
| Nick Lachey | Guest Star | ||
| Mayim Bialik | Guest Star |