[s1e4] M. Night Shaym-aliens! -
Rick realizes they are in a simulation and uses a "rap concert" to overload the system's RAM. They seemingly escape, but the "real world" they return to is actually a second simulation. Rick realizes this when his safe's passcode fails.
This is technically the only episode where the real Morty doesn't appear until the very end and post-credits scene, as he was a simulation for the entire main plot. [S1E4] M. Night Shaym-Aliens!
Their extreme discomfort with nudity is a likely nod to David Cross's "Never-Nude" character from Arrested Development . Rick realizes they are in a simulation and
