Roving Mars was released later in the spring than the second sequel to Now You See Him, Now You Don't.
The Strongest Man in the World is a 1975 Disney film starring Kurt Russell, still a student in the fictional Medfield College. 
Roving Mars is an IMAX documentary film about the development, launch, and operation of the Mars Exploration Rovers, Spirit and Opportunity. 
 It is the sequel to the 1969 film "The Computer Wore Tennis Shoes" and was followed by 1975's "The Strongest Man in the World". 
