Parents need to know that JLA Adventures: Trapped in Time is an animated action-adventure movie that finds the Justice League facing off against Lex Luthor and his Legion of Doom. Luthor is thwarted in the present but gets encased in ice for a thousand years. In the 31st century, two rookie superheroes, Dawnstar and Karate Kid, accidentally release Luthor from his ice prison, and he promptly escapes, gains control of a time travel device, and travels back in time to the present. Expect lots of cartoon violence, fighting, kicking and punching, knockouts, laser guns, ice guns, laser blasts, missiles, and explosions. The Justice League superheroes also use their weapons amidst all the clashing. Some supervillains might be too scary for younger viewers, as Toyman, Bizarro, and the Time Trapper all have creepy, distorted, or monstrous faces. Also, younger viewers might be scared by the Time Trapper vanishing all the superheroes, making them fade away and disappear. While there are some positive messages about teamwork and courage, Wonder Woman gets relegated to the "needing to be saved" role, there's a questionable taxicab scene played for comedy that might be making fun of the accent of taxicab driver, and every problem is quickly solved with violence.