"[It benefits] many children's charities, veterans charities," Shatner said. "Every cent that comes into us goes out to the kids and to the veterans."
Shatner's late Star Trek co-star Leonard Nimoy also was a big supporter of charities, including the Nimoy Foundation, established in 2003 to support the work of artists through grants. In 2009, Nimoy gushed about Shatner, saying, "I consider him like a brother to me."
"I never had a friend like that," Shatner told ET. "It's a tough one to lose."
Nimoy passed away in February due to the end stages of chronic obstructive pulmonary disease (COPD). While Shatner didn't really get a chance to say goodbye to his co-star, he revealed that their last correspondence was meaningful.
"I sent him an email at the very end, telling him to be happy," Shatner said. "That he was loved."