Dwayne "The Rock" Johnson helps two alien kids with superpowers get back to their spaceship and escape the grip of the US government/military guys.
I've seen the original movies years ago on BNT in their Saturday Walt Disney block, and I can say I had a great time watching them.
The first "Escape to Witch Mountain" is based on a novel I've never seen, let alone read, and it was released in 1975, starring Donald Pleasence (SEN from "THX 1138", and later to become famous as Doctor Samuel Loomis from the "Halloween" series)
In 1978 the Escape was followed by "Return to Witch Mountain", and this time the treat is Christopher Lee.
Actors Kim Richards and Ike Eisenmann are together in both films: this one, the original 1975 Disney film Escape to Witch Mountain, as Tia and Toony. In 2002 Ike directed a short titled "The Blair Witch Mountain Project" in which he and Kim step once again in the shoes of their characters for a mockumentary, a gift for the fans of the series. Disney did wise and decided to pay some tribute themselves - Richards portrays the roadside waitress and Eisenmann portrays the Sheriff in an upcoming film.
And while you can get your hands on the first two movies, the next two are hard to find:
In 1982 a TV-sequel was released - "Beyond Witch Mountain"
In 1995 Disney re-made the original as a TV-movie with the same title.
Witch Mountain FanSite: http://deadendinternet.com/witchmountain/