Ted finally meets his mystery girl in the Slutty Pumpkin costume. Meanwhile, Barney learns he is part Canadian, and Lily has pregnancy brain.
|Anthony Van Epperson||Guest Star|
|Christine Pickles||Guest Star|
|Dylan Shea||Guest Star|
|Jack Walsh||Guest Star|
|Katie Holmes||Guest Star|
|Marlowe Peyton||Guest Star|
|Misty Monroe||Guest Star|
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