A visit to the bank ends with Twilight Freezing her account after learning Spike has been using it behind her back. However, Twilights curiosity kicks in when she learns from Rarity about Spikes strange purchases.

When Twilight accidentally walks in on Spike and find him wearing a pink dress his size, she learns that Spike has developed a girly side. Feeling she owes Twilight, Spike decides to follow Twilights word and pay off the money he took out of the account. From hiding a secret, to his friends accepting him, Spikes journey into Girlyhood begins, with the help of somepony he loves.