British Invasion

BBC America is now in HD, kicking off with the premiere of “Torchwood:

Children of Earth.” Told over five consecutive nights, the mini-series starts with creepily possessed children tipping off Captain Jack (John

Barrowman) and company about Earth’s biggest alien invasion yet. Later, “Primeval” wraps up its third season with the team fending off new antediluvian creatures and trying to stop mad paleontologist Helen (Juliet

Aubry) from going back in time to halt human evolution. Finally, it’s the premiere of the dramedy “Being Human,” starring 20-something roomies — a werewolf, vampire and ghost masquerading as normal human beings — navigating through the complexities of life.

* TORCHWOOD:

CHILDREN OF EARTH

Monday, 9 p.m., BBC America

* PRIMEVAL

Saturday, 8 p.m., BBC America

* BEING HUMAN

Saturday, 9 p.m., BBC America

Pregnant pause

Lindsay Lohan takes a break from acting out in the tabloids to play Thea, an assistant in a dead-end job at a publishing company. To save her job after a screw up, Thea pretends to be pregnant and things predictably spiral out of control. Overnight, she becomes the manager of the company’s new family division, navigates a romance with her manager (Luke Kirby) and tries to convince a talk show host (Janeane Garofalo) to promote a new book — all while foiling a suspicious assistant (Kevin Covais) and trying to figure out what to do when she doesn’t actually give birth.

* LABOR PAINS

Sunday, 8 p.m.,

ABC Family

Moving witness

While U.S. Marshal Mary Shannon (Mary McCormack) acts as a technical advisor on a new Marshals Service training video, her partner Marshall Mann (Frederick Weller, right) arranges to get one of WITSEC’s first witness relocation members — a geriatric mobster played by Martin Landau — to his son’s funeral, resulting in a road trip that takes them from Albuquerque to Philadelphia.

* IN PLAIN SIGHT

Sunday, 10 p.m., USA

‘Buffy’ alums back in action

Julie Benz and James Marsters — who played vampires on “Buffy the Vampire Slayer” — are starring in their own TV movies this week. In “Held Hostage,”

Benz plays Michelle Estey, a woman forced to rob the bank she works for or watch her daughter die. Michelle makes her choice, leaving the FBI to question just how much of a victim she really is. Meanwhile, Marsters takes on the fabled role of Buzz Aldrin in “Moonshot,” a dramatization of the Apollo 11 flight. Original NASA footage is spliced in with the astronaut trio’s arguments over who takes the first step on the Moon.

* HELD HOSTAGE

Sunday, 7 p.m., LMN

* MOONSHOT

‘Kitchen’ heats up again

In the two-hour sixth season premiere, 16 chefs get cooking right away when Gordon Ramsay (left)gives them the signature dish challenge. This time around, it turns into a team effort that sets men against women, with the winning team gets a coveted prize. The highlight of the episode comes when one chef goes head-to-head with Ramsay, for the first time ever, in the intense elimination round.

* HELL’S KITCHEN

Tuesday, 8 p.m., Fox

‘Dating’ blackout

SIX singletons — three men and three women — live together, segregated from the opposite sex. They only meet and “date” in complete darkness. (You get to watch their shenanigans through infrared cameras.) At the end of the episode, the couples see each other in the light of day and decide whether love is really is blind.

* DATING IN THE DARK

Monday, 10 p.m., ABC

Monday, 8 p.m., History Channel