The Backyardigans' 'Castaways' song from 2005 has gone viral on TikTok, and this indie-pop remix is just the icing on the cake.

About 15 years after it first aired on 'The Backyardigans,' a song from the series is gaining popularity on TikTok from nostalgic fans.

From The Backyardigans to Spongebob Squarepants, these are the best theme songs from our favorite childhood tv shows!

"Castaways" debuted on the top of a Spotify chart after the song from the children's cartoon "The Backyardigans" went viral on TikTok.