Planck scale
Concept
An energy scale beyond which traditional notions of particles break down due to extreme gravitational effects.
Mentioned in 3 videos
Videos Mentioning Planck scale

Stephen Wolfram: Complexity and the Fabric of Reality | Lex Fridman Podcast #234
Lex Fridman
A fundamental scale in quantum gravity, approximately 10^-34 meters, which Wolfram's model suggests is modified by the number of quantum execution threads in the universe.

Harry Cliff: Particle Physics and the Large Hadron Collider | Lex Fridman Podcast #92
Lex Fridman
The enormous energy scale of quantum gravity, at which the Higgs field would cause even electrons to collapse into black holes if it were that strong.

Dark matter: the next frontier – Public lecture by Dr. David E. Kaplan
Fermilab
An energy scale beyond which traditional notions of particles break down due to extreme gravitational effects.