The “supervoid CMB cold spot link” concerns whether the prominent CMB Cold Spot can be explained by the integrated Sachs–Wolfe/Rees–Sciama imprint of a large underdensity, notably the Eridanus supervoid, along that line of sight (Finelli et al. 2014; Kovács & García-Bellido 2016). Detailed surveys now find that, within ΛCDM, the measured depth and size of the Eridanus supervoid can account for only a small fraction of the Cold Spot’s ≈ -150 µK temperature depression, and lensing constraints further rule out a single, sufficiently deep void anywhere along the line of sight, leaving a residual anomaly that standard ISW physics and Gaussian initial conditions struggle to explain (Zibin 2014; Mackenzie et al. 2017).