On TV Tonight, Monday 4/13: GREEK, MEDIUM, and more…

CHUCK “Chuck Versus the First Kill” – 8pm NBC

GREEK “Engendered Species” – 8pm ABC Family

HOUSE “Saviors” – 8pm Fox

HOW I MET YOUR MOTHER “Mosbius Designs” – 8:30pm CBS

24 “Day 7: 1:00AM-2:00AM” – 9pm Fox

IN TREATMENT “Oliver: Week Two” & “Walter: Week Two” & “Gina: Week Two” – 9pm & 9:25pm & 9:50pm HBO

CASTLE “Always Buy Retail” – 10pm ABC

MEDIUM “Then…and Again” – 10pm NBC