Mr. Caruthers' History Club once again travels back in time, but this time they have to babysit Jacob and Zack's brother, Gabe, while convincing Dr. Martin Luther King to lead the voting-rights march to Montgomery, Alabama, in 1965.

Get out the vote!

It's another exciting Monday for Abigail, Zack, Jacob, and Bo -- they are going to jump back to the past to meet Dr. Martin Luther King Jr.! The kids need to convince Dr. King not to get discouraged and to lead one of his famous voting rights marches. And they've got to do it with the twins' baby brother, Gabe, in tow!

But today's mission will be more challenging -- and more suprising -- than any that they've faced so far. Luckily this time they'll get some help from two very special people....