Along with Martin Paas, Haffke scripts the Pferd and Wolle sketches, as well as the 30th anniversary Sesamstrasse special. In the summer of 2006, Haffke and Paas began performing puppetry and voices for Bert and Ernie, respectively, in new segments exclusive to Sesamstrasse. He was interviewed for the 2013 documentary Als die Sesamstrasse nach Deutschland kam.
- Sesamstrasse: Pferd (2002-present), Bert (2006-present), Wolfram Wolf, Reiner Sauberhasi, others
- The Secret Life of Toys: Additional Puppeteer