In "Cell Test", Michael needed to test whether his cell mate, Sucre could be trusted. At the end of the episode, he found out about Michael's plan and he was angry and said he did not want to be involved in the plan because he would be out in another 16 months. Sucre moved out from Michael's cell and who moved in?

After Sucre learns about Michael's escape plan and requests a cell transfer because he's only 16 months from release (wanting to avoid the risk), Haywire becomes Michael's new cellmate. This is a pivotal moment because Haywire's mental instability and erratic behavior initially complicate Michael's plans, though Michael later learns to manipulate him. The cellmate change sets up several important plot developments.