arising in New York. Appellee was incarcerated in New York from February 3, 1999, to March 13, 1999. On February 12, 1999, while Appellee served his sentence in New York, the Commonwealth lodged a detainer against him. On March 5, 1999, eight days before his release from prison in New York, Appellee agreed to waive his extradition and return to Pennsylvania. The Commonwealth obtained custody of Appellee on March 13, 1999, and placed him in Dauphin County Prison on March 15, 1999.
On August 2, 1999, Appellee filed a Motion to Dismiss pursuant to the Interstate Agreement on Detainers Act (IAD), 42 Pa.C.S.A. §§ 9101-9108, alleging that the Commonwealth failed to bring him to trial within 120 days following his return to the *175 custody of the Commonwealth. OnCommonwealth did not offer good cause regarding why Appellee was not brought to trial within this time, the Superior Court concluded that the trial court properly granted Appellee's motion to dismiss.

DISCUSSION
Appellee contends that the IAD provides a mechanism that allows a sentenced prisoner located in the sending state to be brought to the receiving state to face outstanding charges in that state. According to Appellee, the Commonwealth lodged a capias "as a detainer" against Appellee, while he was serving his sentence in Buffalo, New York. Appellee contends that such an act invokes Article IV of the IAD, and the Commonwealth had 120 days to bring Appellee to trial. Appellee further argues the fact that he completed his sentence in New York before being returned to Pennsylvania does not