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The Annual Two-parter is a two-parter story arc that occurs in every Season (except Season 1). They air during ABC's February sweeps (except the Season Two two -parter which occurred in March, due to the airing conflict with the 2010 Winter Olympics.

Season 2[]

The Season 2 two-parter refers to the annual two-parter from Season 2.

  • Tick, Tick, Tick…, the begging of the two-part story arc aired on March 22, 2010.
  • Boom!, the conclusion to the two-part story arc aired on March 29, 2010.

Season 3[]

The Season 3 two-parter refers to the annual two-parter from Season 3.

  • Setup, the begging of the two-part story arc aired on February 21, 2011.
  • Countdown, the conclusion to the two-part story arc aired on February 28, 2011.

Season 4[]

The Season 4 two-parter refers to the annual two-parter from Season 4.

  • Pandora, the begging of the two-part story arc aired on February 13, 2012.
  • Linchpin, the conclusion to the two-part story arc aired on February 20, 2012.

Season 5[]

The Season 5 two-parter refers to the annual two-parter from Season 5.

  • Target, the begging of the two-part story arc aired on February 18, 2013.
  • Hunt, the conclusion to the two-part story arc aired on February 25, 2013.

Season 6[]

The Season 6 two-parter refers to the annual two-parter from Season 6.

  • Valkyrie, the beginning of the two-part story arc aired on September 23, 2013.
  • Dreamworld, the conclusion of the two-part story arc aired on September 30, 2013.
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