Tractor beam

A tractor beam was a beam of energy projected from a vessel or device which could tether and pull another object.

The Doctor's TARDIS
The Fourth Doctor used his TARDIS' gravity tractor beam to hold a neutron star still while Erato used his ship to weave a protective shell around it. In the process, the tractor beam burned out (TV: The Creature from the Pit), remaining inoperative into at least the Doctor's eighth incarnation (PROSE: The Taking of Planet 5).

It had been repaired by the Doctor's tenth incarnation when he used it to save the Sanctuary Base 6 rocket from a black hole. (TV: The Satan Pit)

The Doctor's TARDIS could create a smaller tractor beam with the help of the Master's laser screwdriver. (GAME: TARDIS)


 * The Doctor's TARDIS also had an anti-gravity spiral that had similar properties to a tractor beam. (TV: Delta and the Bannermen)

Others
The Time Lord Azmael intended to employ a tractor beam to move two minor planets in the same orbit of the planet Jaconda, previously under his protection. The Sixth Doctor made him change his mind, by pointing out the consequences. (TV: The Twin Dilemma)

During the end of the Doctor's encounter with a pan-dimensional being, his TARDIS got caught in a tractor beam heading towards Lakertya caused by the Rani. (PROSE: Spiral Scratch, TV: Time and the Rani)

Other occurrences
Chula warships, such as the one stolen by Jack Harkness, possessed a tractor beam. (TV: The Empty Child/The Doctor Dances)

A Sontaran ship, captured in an alternative Death Zone on Gallifrey, was provided with such a beam. (AUDIO: ''The Five Companions)

K9 Mark 2 possessed a tractor beam which could pull an object as large as an adolescent humanoid, (TV: Fear Itself) he could also use it to absorb microscopic objects. (TV: Black Hunger)