"Bridezillas" 8 p.m. WE (10th season debut) — A self-centered bride battles a wedding planner who happens to be her future mother-in-law.

"Space Warriors" 8 p.m. Hallmark — A group of youths attending space camp rescue three astronauts.

"What Would You Do?" 9 p.m. ABC (seventh season debut) — ABC's hidden-camera show is back.

"Randy to the Rescue" 9 p.m. TLC (second season debut) — A bridal magazine publisher covets a dress unlike she's ever seen before.

"Merlin" 10 p.m. Syfy (series finale) — Morgana threatens to destroy Camelot.

"Pregnant & Dating" 10 p.m. WE (new series) — Atlantan Keisha is one of five women who are single, pregnant and still seeking Mr. Right.