Catch “Key Largo,” part of a daylong tribute to Lauren Bacall on TCM; “MasterChef” contestants cook for the first responders who battled Southern California’s Thomas Fire.

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‘Ancient Invisible Cities’

Premiere of three-part series exploring wonders of the ancient world through cutting-edge 3D scans that reveal architecture and features that have been concealed for centuries; uncovering the hidden secrets of Athens, from the buildings on the Acropolis to silver mines and quarries; 9 p.m. Wednesday on KCTS.

Also on Wednesday

“Key Largo,” 7 p.m. (TCM): The 1948 movie starring Humphrey Bogart, Lauren Bacall and Edward G. Robinson, part of a daylong tribute to Lauren Bacall’s movies.

“Greenleaf,” 7 p.m. (OWN): Grace takes Rochelle up on her offer to start a legal-defense fund; Bishop and Lady Mae ask if a parishioner’s Powerball winnings can assist with their IRS bill; repeats at 10 p.m.

“Robot Wars,” 7:05 p.m. (SCIENCE): Forty teams of robot-fighting enthusiasts battle it out over a series of rounds in an arena to become the Robot Wars champion.

“Big Brother,” 8 p.m. (KIRO): House guests vie for the power of veto; a veto meeting may lead to an eviction nominee being saved.

“MasterChef,” 8 p.m. (KCPQ): Gordon Ramsay and fellow judges direct contestant cooks to prepare dishes for the heroic first responders who battled southern California’s devastating Thomas fire.

“Alone Together,” 8:30 p.m. (FREEFORM): Season-two finale; Esther and Benji try to stop Jeff from becoming a boring couples-person by hijacking his Big Bear couples retreat.

“World of Dance,” 9 p.m. (KING): The top three highest-scoring acts from each division move on to the divisional final; guest judges Mel B and Paula Abdul.

“The Real Housewives of Dallas,” 9 p.m. (BRAVO): Kameron invites everyone to fly to Colorado on the Wescotts’ private jet to stay at their luxury home; D’Andra and Brandi put their social-media squabble on ice for the weekend.

Madeline McKenzie: Program times may vary depending on your cable provider or service.