"Mighty Merc" is the second segment of the fifth episode of Miles from Tomorrowland. It premiered on February 13, 2015 alongside "Catch That IOTA!".
M.E.R.C. worries that his time with the Callisto family is over when they try out a more advanced robot named Axel.
- Cullen McCarthy as Miles Callisto
- Fiona Bishop as Loretta Callisto
- Olivia Munn as Phoebe Callisto
- Tom Kenny as Leo Callisto
- Dee Bradley Baker as M.E.R.C.
- May 23, 2015 (Latin America)
- May 30, 2015 (Spain and Portugal)
- May 28, 2015 (Germany)
- May 26, 2015 (Poland, Romania, Middle East, Africa)
- July 2, 2015 (Hungary)