A stochastic dislocation dynamics model was developed for investigating dislocation glide through dispersed obstacles. The model accounted for the dynamics of flight between successive metastable dislocations, under various drag mechanism, using discrete dislocation dynamics. The thermal activation processes for metastable pinned dislocations involved a stochastic force. The integration of the 2 processes permitted an examination of the transient regime of dislocation motion between obstacle-controlled motion and drag-controlled motion. The stress and temperature dependences of the average dislocation velocity revealed an obstacle-controlled region below the critical resolved shear stress and a drag-controlled region above the critical resolved shear stress; in good qualitative agreement with experimental data. In the transient region just below the critical resolved shear stress, a negative temperature sensitivity was observed which was due to a competition between drag effects on dislocation flight, and thermal activation processes.