TOP PICK: ‘Heroes‘ (9pm ET on NBC)
In the climactic season finale, everyone bands together in an effort to stop Samuel (Robert Knepper) from taking the lives of thousands. Peter joins forces with his most unexpected ally to save Emma (guest star Deanne Bray). Meanwhile, H.R.G.’s life hangs in the balance as he and Claire find themselves trapped underground with oxygen quickly running out. Elsewhere, Hiro starts to come to grips with the decisions he has made and is called into action to help stop a disaster.
KEY EPISODE: ‘House‘ (8pm ET on Fox)
During a day in the life of Princeton Plainsboro’s Dean of Medicine, Dr. Lisa Cuddy, the inner workings of the hospital are seen through her eyes. This day proves to be especially trying as Cuddy wrestles with myriad hospital issues and staff disputes that test her perseverance and skills as an administrator, all while juggling issues in her personal life, in the all-new “5 to 9″ episode.
WATCH: ‘The Bachelor‘ (8pm ET on ABC)
The stakes are high for Jake as he leaves his Los Angeles home for an exciting, emotionally charged journey across the country to visit the final four women’s hometowns. Why is Gia afraid of falling in love? How will Ali’s mother judge Jake in comparison to her past boyfriends? Is Tenley really ready for a new relationship after her tough divorce? And what part will Vienna’s father play in the drama between Jake and his daughter? Just when Jake feels confident of his next decision, one bachelorette turns everything upside down in a single, gut-wrenching moment, leaving Jake reeling.
DVR: ‘The Big Bang Theory‘ (9:30pm ET on CBS)
Leonard can only bring one guest on a trip to see CERN’s Large Hadron Collider (the world’s largest and highest energy particle accelerator) in Switzerland on Valentine’s Day.
DVR: ‘Celebrity Fit Club‘ (9pm on VH1)
This season boasts a cast full of pop culture personalities ready to bare their bodies and souls as they dig in for the most grueling fitness program on television designed to help them drop not only their flab, but also their emotional baggage. Battling the bulge this season are legendary R&B bad boy Bobby Brown, Jay McCarroll (winner of “Project Runway,” Season 1), KayCee Stroh (“High School Musical”), dancer and choreographer Kevin Federline, former “Baywatch” babe Nicole Eggert, Sebastian Bach (Former lead singer of Skid Row), actress Shar Jackson (“Moesha”), and infamous “Bad Girl” Tanisha Thomas (“Bad Girls Club”, Season 2).