Implicating mystery_(mystery_skulls) → mystery_skulls
Link to implication

Reason:

Suggest all four mystery_skulls characters imply to mystery_skulls.
1) arthur_(mystery_skulls)
2) lewis_the_skeleton
3) mystery_(mystery_skulls)
4) vivi_(mystery_skulls)

https://en.wikipedia.org/wiki/Mystery_Skulls#Videos says:
"The video follows "Mystery Skulls", a group similar to Scooby-Doo's Mystery Inc., made up of members Vivi, Arthur, and their dog Mystery. The group's van breaks down and they find and explore a haunted mansion, but find themselves chased by a skeletal ghost; a flashback reveals that the ghost is Lewis, a former Mystery Skulls member"
and "... Mystery (The dog who in the previous video was revealed to be a kitsune/fox spirit) "