1. The Curse of Dethklok - TV-14-DLV
2. Dethwater - TV-14-SV
3. Birthdayface - TV-14-LV (Original rating)/TV-14-DLV (Re-rating) - Murderface playing the guitar with his dick doesn't count as an S.
4. Dethtroll - TV-14-DLV (Original rating)/TV-14-V (Re-rating)
5. Dethkomedy - TV-14-DLV
6. Dethfam - TV-14-DLV - The interviewer's death in the cold open isn't enough to get a TV-MA IMO.
7. Performanceklok - TV-14-LV (Original rating)/TV-14 (Re-rating) - Twinkletits getting attacked by wolves isn't enough for a V, since it wasn't really shown. And one use of "pussies" doesn't get an L.
8. Snakes n' Barrels - TV-14-DL (Original rating)/TV-14 (Re-rating)
9. Mordland - TV-14-V
10. Fat Kid at the Detharmonic - TV-14-DLV
11. Skwisklok - TV-14-V - The only violent part is in the cold open, so it should be fine with this rating.
12. Murdering Outside the Box - TV-14-LSV (Original rating)/TV-MA (Re-rating)/TV-14-V (Current rating) - The undercover agent getting impailed on Murderface's codpiece isn't enough.
13. Go Forth and Die - TV-14-L (Original rating)/TV-14 (Re-rating) - The cold open isn't enough for a V.
14. Bluesklok - TV-14-DLV (Original rating)/TV-14-V (Re-rating)
15. Religionklok - TV-MA (Original rating)/TV-14-V (Re-rating) - Same reason as Brady.
16. Dethkids - TV-14-DL (Original rating)/TV-14 (Re-rating)
17. Dethclown - TV-14-DLS (Original rating)/TV-14-DL (Re-rating) - Dr. Rockso sticking his hand down Murderface's pants isn't enough to get an S.
18. Girlfriendklok - TV-MA (Original rating)/TV-14-DLSV (Re-rating)
19. Dethstars - TV-14-LV (Original rating)/TV-MA (Re-rating) - Just for someone getting impailed on a forklift.
20. The Metalocalypse Has Begun - TV-MA-V - Need to rewatch.