Terra Nova

Some humans left earth and started a new colony on a new planet 70 years ago, back when it took 9 years each way to get to the planet from earth. Something goes wrong on the new planet and the humans forget somehow that they are humans, move underground, eat only "digger meat" and start hating humans, whom they all accuse of speaking "shale". Unexplained was the severe acne and extreme dis-coloring of these "humans".  The fate of these folks had been a bigger mystery than Flight 19 in the Bermuda Triangle, but luckily Archer and his crew, especially the Boomer, who is obsessed with the Terra Nova mystery, got the credit for solving it.