Dawn Of X: 10 Spin-Off Comics Marvel Must Make

Geneticist Mr. Sinister found that a union between the X-Men Scott Summers and Jean Grey would produce a powerful genetically superior mutant. Sinister hoped he could control such a mutant.

Sinister created a clone of Jean and named her Madelyne Pryor. Sinister's plan was to produce the child he needed from the union of Madelyne and Scott. Sinister considered his clone a failure until a spark from the Phoenix Force granted Madelyne a life force and some of Jean's memories.

Sinister crafted a false background for her and arranged for her to meet Scott. Scott was instantly drawn to Madelyne. Madelyne later became pregnant and had a son who she named Nathan Christopher Charles Summers.

Scott and Madelyne's marriage became strained. Everything worsened when Jean was discovered alive. Scott left little Nathan and Madelyne to reunite with Jean. Hearing of Jean's return, Mr. Sinister sent his Marauders to capture Nathan and to kill Madelyne, before she could be exposed as a clone.

A spin-off of Summer’s story could follow the time he spent with Mr. Sinister as a prisoner where he was largely treated as a lab rat whilst conscious, and kept in an incubation pod when not needed. The story could center around Summer’s attempts to make sense of his previously normal family life, baring the knew knowledge that he had been genetically engineered from the beginning, as well as his relationship with his "creator", Mr. Sinister.