Task: Question Understanding
Input (English): Context : Thirty Seconds Over Tokyo stars Van Johnson as Lawson, Phyllis Thaxter as his wife Ellen, Robert Walker as Corporal David Thatcher, Robert Mitchum as Lieutenant Bob Gray and Spencer Tracy as Lieutenant Colonel Jimmy Doolittle, the man who planned and led the raid. 
Question : Which production company is involved with Thirty Seconds Over Tokyo?
Output (English): production company