The Ugly Underneath is the fifth comic adventure of The Cybermen series focusing on the Cybermen on Mondas and the Silurians native to the planet.
to be added
- Golgoth destroyed the Cybermen and itself in a war.
- The Cult of C'iva exist in the remnants of Cyber control and await the return of Golgoth's Son
- Mondas is a dying planet, due to it leaving the solar system, which was referenced in The Dead Heart.
- Golgoth's son, which appeared in The Future Perfect and still a developing embryo, makes an appearance.