TERRA NOVA, Monday, 8 p.m., Fox

DEXTER, Tonight, 9 p.m., Showtime

HELL ON WHEELS, Tonight, 10 p.m.,AMC

RIZZOLI & ISLES, Monday, 10 p.m., TNT

Tight quarters

The colony makes a last stand to fight for the future in the two-hour season finale of “Terra Nova.” The 11th pilgrimage arrives in Terra Nova and the mysterious Phoenix Group in 2149 makes its move to pillage the past with the help of Lucas and Mira. Meanwhile, Jim (Jason O’Mara, below left) and Taylor (Stephen Lang) team up in a last stand against the Phoenix Group, a colonist makes the ultimate sacrifice and a decision is made that will change life in Terra Nova forever. Co-starring Shelley Conn.

TERRA NOVA

Monday, 8 p.m., Fox

Doomsday mission

It’s been a very good year for Michael C. Hall of “Dexter.” His show was renewed for another two seasons, making the serial killer crime show the most successful in Showtime’s history, and he got a handsome raise. Yes, Dexter Morgan, in all his murderous glory, has become part of our culture. For the sixth-season finale, he is on a mission with the Homicide department to stop the Doomsday killers from committing another murder during the lunar eclipse. Meanwhile, Debra (Jennifer Carpenter) bravely faces up to another emotional situation.

DEXTER

Tonight, 9 p.m., Showtime

Brenda’s back in action

In this episode of The Kyra Sedgwick Farewell Tour, a k a “The Closer,” the Major Crimes Division investigates a hit-and-run murder of a young girl on a bicycle. Mark Moses and Elizabeth Perkins guest-star as the LAPD’s Police Commissioner and his wife, Gail, who may be in trouble when Brenda (Sedgwick, above right) becomes determined to uncover a scandal one of them tried to cover up. With J.K. Simmons (above left) and Tony Denison (above center).

THE CLOSER

Monday, 9 p.m., TNT

So much for freedom

Freed slave Elam’s (Common, right) life hangs in the balance, leaving Cullen (Anson Mount) with a monumental decision. Meanwhile, Durant (Colm Meaney) risks his financial fortune and Lily (Dominique McElligottt) confronts her in-laws.

HELL ON WHEELS

Tonight, 10 p.m., AMC

Dance of death

The world of competitive dance turns deadly when the mother of a star performer is stabbed to death at a competition. Jane (Angie Harmon, right) and Maura (Sasha Alexander) search for clues, but they soon realize something is off about the woman’s history. Korsak (Bruce McGill, left) has his hands full when his stepson is accused of shooting a cop. Lolita Davidovich returns as Korsak’s ex.

RIZZOLI & ISLES

Monday, 10 p.m., TNT

Traitor among us

IN the first-season “Homeland” finale, a near-catatonic Carrie (Claire Danes) is confined to bed — which means she won’t be on the verge of tears, for a change — as Saul (Mandy Patinkin) puzzles over the unnerving time line of recent events. Elsewhere, Walker prepares to complete his mission, and Brody (Damian Lewis, above) preps for the vice president’s policy submit.

HOMELAND

Tonight, 10 p.m., Showtime