Mutants
These are mutant criminals that have been captured by Time Force and cryogenically frozen in the Cryo-Prison as shrunken figures. When Ransik hijacked it, he had an army of mutants at his disposal. Every Mutant has a DNA patch on their bodies that causes them to grow to a massive size if removed. They revert back to their shrunken state when defeated in normal or giant forms, after which one of the Rangers places them in a studded container with a window on the front that displays the imprisoned mutant. The containers are stored in a fridge-like unit in the Rangers' base, ready for transport back to the future.
Several of the most dangerous mutants are placed in a separate location called the X-Vault. They serve Frax, as he is the only one with the key to the vault.
Read more about this topic: Villains In Power Rangers Time Force