Should there be a comma before the highlighted word?

I know, where Thomas the Tank Engine hides all his candy.

Keep the Comma

Remove the Comma

Remove the Comma

Should there be a comma before the highlighted word?

I know, where Thomas the Tank Engine hides all his candy.

Keep the Comma

Remove the Comma

Keep the Comma

The comma should be kept before the word "where" in this sentence to indicate a pause after "I know."