"Supernatural" returns Jan. 21 on The CW, and the network has released a synopsis of the next two Season 5 episodes.

"Sam, Interrupted":
A former hunter named Martin, who is currently institutionalized, calls Sam (Jared Padalecki) and Dean (Jensen Ackles) for help investigating a case in the mental hospital. The brothers get themselves admitted as patients to check out the mysterious monster that is attacking the patients, but their incarceration pushes both to the breaking point as they unleash their inner demons against each other.

"Swap Meat":
Gary (guest star Colton James), a teenage nerd, conjures up a body-switching spell and changes bodies with Sam. Thrilled by his new handsome and built body, Gary (now Sam) investigates a case with Dean (Jensen Ackles) and takes advantage of his good looks and age by hitting on women and getting drunk. Meanwhile, Sam is stuck in Gary's teenage body, dealing with intrusive parents and high school.

"Supernatural" airs Thursdays at 9 p.m. ET/PT on The CW.