TOS: The Changeling, streamed on Netflix.
Tan-ru must have had some sort of self repair capability based on nanotechnology, as the post-merger version of Nomad looks like it was built in a factory instead of having been cobbled together from the spare parts of two probes.
Still not sure how something as small as Nomad has the ability to attack Enterprise with the equivalent energy of 90 photon torpedos, absorb the energy of the one Kirk fired at it, can travel at warp speed.. What sort of incredible miniature power source makes all of this possible?