In the second season premiere, Lowe welcomes contestants, including a former NFL player who is out to prove there's more to him than just his muscles; a teacher and philanthropist; an entrepreneur; a super-competitive gameshow veteran; and a trained knife and sword champion fighter.

Lowe welcomes contestants including a NASA robotics researcher and his scientist fiancé, a magic enthusiast and a health app developer.

Host Rob Lowe welcomes contestants, including an Army veteran, medical lab scientist and animal activist, one of whom may defeat the Circle of Samurai and win over $100,000.

Rob Lowe welcomes contestants, including a model, a former military man, a woman who lost her childhood home in Hurricane Dorian, and a recent black belt in karate, one of whom may defeat the Circle of Samurai and win more than $100,000.

The contestants attempt to stay focused and answer a wide variety of interactive questions of knowledge, memory, puzzles, and sequencing.

No description available

Rob Lowe welcomes contestants in the first hour, including a professional stilt walker, a poker player, an aspiring astronaut and a jewelry designer, one of whom may defeat the Circle of Samurai and win over $100,000. In the second hour, Lowe welcomes a restaurateur, a librarian, a new father, an engineer and a mammal trainer

Contestants include a valedictorian; a former NFL player turned voice-over artist; an Army Veteran; a CEO; and a veterinary doctor.

Host Rob Lowe welcomes new contestants including a competitive baton twirler, a CSI Forensic Scientist, a former Navy Cryptologist and a Pre-Med Student, one of whom may defeat the Circle of Samurai and win more than $100,000.

Another crop of eager contestants battle the boundaries of their minds to answer questions in 4 categories – knowledge, memory, puzzles and sequencing – accurately with speed and precision in an attempt to become a “Mental Samurai.”

Another crop of eager contestants battle the boundaries of their minds to answer questions in 4 categories – knowledge, memory, puzzles, and sequencing – accurately with speed and precision in an attempt to become a “Mental Samurai.”

Another crop of eager contestants battle the boundaries of their minds to answer questions in 4 categories – knowledge, memory, puzzles, and sequencing – accurately with speed and precision in an attempt to become a “Mental Samurai.”

Another crop of eager contestants battle the boundaries of their minds to answer questions in 4 categories – knowledge, memory, puzzles, and sequencing – accurately with speed and precision in an attempt to become a “Mental Samurai.”

Another crop of eager contestants battle the boundaries of their minds to answer questions in 4 categories – knowledge, memory, puzzles, and sequencing – accurately with speed and precision in an attempt to become a “Mental Samurai.”

Another crop of eager contestants battle the boundaries of their minds to answer questions in 4 categories – knowledge, memory, puzzles and sequencing – accurately with speed and precision in an attempt to become a “Mental Samurai.”

Contestants battle the boundaries of their minds to answer questions in 4 categories – knowledge, memory, puzzles, and sequencing – accurately with speed and precision in an attempt to become a “Mental Samurai.”

Another crop of eager contestants battle the boundaries of their minds to answer questions in 4 categories – knowledge, memory, puzzles and sequencing – accurately with speed and precision in an attempt to become a “Mental Samurai.”

Another crop of eager contestants battle the boundaries of their minds to answer questions in 4 categories – knowledge, memory, puzzles, and sequencing – accurately with speed and precision in an attempt to become a “Mental Samurai.”

The best of the best return and battle the boundaries of their minds to answer questions in four categories - knowledge, memory, puzzles and sequencing - accurately with speed and precision in an attempt to become a "Mental Samurai." Find out who will crack under pressure.