Splinx
Splinx was a robot cat that assisted the Doctor in the Mines of Terror. (VG: Doctor Who and the Mines of Terror)
Abilities
Completely programmable by the Doctor, Splinx was able to fetch and store items larger than herself thanks to a dimensionally transcendental hyperspace load module. Items Splinx carried remained undetectable to external sensors. Splinx could remain undetectable to other creatures and proximity sensors. The Doctor had location markers he could leave in various places, to which Splinx could always find her way back to.
Splinx was powered by Ulrick Neobium energiser cells, which needed to be recharged at external power points from time to time.