While Mi-Go Scientist is ready, it gains:

"Forced - At the start of the enemy phase: If Brain Case is attached to Mi-Go Scientist, move Mi-Go Scientist once toward the Fungus Mound. Otherwise, move Mi‑Go Scientist once toward Brain Case’s location, and if it is at Brain Case’s location, attach Brain Case to it (if it is under an investigator’s control, they lose control of it)."