Andrew Gregory Sega (born May 20, 1975), also known as Necros, is an American musician best known for tracking modules in the 1990s demoscene as well as for composing music for several well-known video games. He is currently part of the group Iris and a live member of Stromkern, and has his own recording label known as Diffusion Records.

Sega's main solo project is known as The Alpha Conspiracy.