Alias is now available for purchase at iTunes, Disney-ABC Television Group just announced. To help increase awareness of and anticipation for the series' new season, fans of the program can now purchase individual episodes from seasons four and five (the current season) for $1.99. The entire fourth season is also available for $34.99.

The Emmy Award-winning spy drama returns with a two-hour special event tonight (8:00-10:01 p.m., ET) and will air in its regular time period thereafter on Wednesdays (8:00-9:00 p.m., ET), until its series finale in May.

The electrifying return event includes the birth of Sydney's baby and the reappearance of Michael Vaughn (Michael Vartan). New episodes of the current season, leading up to the dramatic series finale, will be available on iTunes the day after they air on ABC.